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Happy Campers Extreme RV Holding Tank Cleaner

4.4 4.4 out of 5 stars 953 ratings

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Purchase options and add-ons

Brand Happy Campers
Item Form Granule
Specific Uses For Product Toilet
Material Feature Unscented
Item Volume 4 Gallons

About this item

  • Super cleans RV holding tanks
  • Sensors: Restore poor working sensors
  • Remove persistant odors
  • 45 Minute drive for best results
See more product details

Additional Details

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$38.45 ($2.14/Ounce)
Get it as soon as Tuesday, Apr 2
In Stock
Sold by RV CAMPERS and ships from Amazon Fulfillment.
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$55.45 ($0.87/Ounce)
Get it as soon as Tuesday, Apr 2
In Stock
Sold by RV CAMPERS and ships from Amazon Fulfillment.
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$94.45
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Product Description

Before and After Using Happy Campers Extreme Cleaner on a Gray Holding Tank

before and after using happy campers extreme cleaner in gray holding tank
Extreme RV Black and Gray Holding Tank Cleaner

Happy Campers Extreme Holding Tank Cleaner for Black and Gray Tanks

The Extreme Holding Tank Cleaner by Happy Campers is just that — Extreme!

Use this product when you need to totally clean an RV or Marine holding tank. Works for both black water and gray water holding tanks.

This is NOT a regular maintenance treatment to control odor, this product is designed to completely clean your holding tank when you know you've got a problem. If there is stubborn buildup, mold, or other disgusting gunk in your holding tanks, this will get it out.

We highly recommend that you watch what comes out of your holding tank even if you thought it was fairly clean — you'll be surprised.

Just take a look at these actual images shown above of an RV gray holding tank that appeared to be clean. The water was running clear before using the Extreme Cleaner treatment and WOW, look what came out.

The Extreme RV Holding Tank Cleaner is Easy to Use:

How to use Happy Campers Extreme Cleaner
How to Use Happy Campes Holding Tank Treatment

How To Use Happy Campers Extreme Holding Tank Cleaner?

1. Dump and Thoroughly Rinse Holding Tank.

Make sure you empty what you can out of your RV holding tanks before starting.

2. Mix entire container into 4 gallons of hot water.

Mix the product until it's fully dissolved and then pour it down a sink or flush it down the toilet.

3. Add more water, wait and then dump.

Add 5-7 more gallons of water, then drive for a minimum of 45 minutes (or until you reach your destination). Then dump and rinse your tank.

*If stationary; fill your tank and let it set 24-48 hours before dumping.

About the Extreme Cleaner:

  • It thoroughly Clean holding tanks.
  • Cleans poor working sensors.
  • Perfect for when You just bought your RV & want to super clean the tanks for a fresh start.
  • A great product for an annual clean out, especially when winterizing.
  • *Recommended for use in 30-60 gallon tanks.
Happy Campers 18 Treatment Holding Tank Deoderizer Treatment Happy Campers RV Holding Tank Deodorizer Treatment - 64 treatments Happy Campers RV Waste Water & Gray Holding Tank Deodorizer Treatment - 130 treatments Happy Campers Extreme RV Holding Tank Cleaner
Happy Campers -18 Treatments Happy Campers -64 Treatments Happy Campers -130 Treatments Happy Campers Extreme RV Holding Tank Cleaner
Customer Reviews
4.7 out of 5 stars
13,139
4.8 out of 5 stars
15,598
4.8 out of 5 stars
1,339
4.4 out of 5 stars
953
Value Per Treatment $1.57 $.87 $.73 Container = 1 Treatment
Odor Control Complete Complete Complete
Prevents Buildup Removes Buildup & Sludge
Climate Extreme heat & cold Extreme heat & cold Extreme heat & cold Extreme heat & cold
Time Effective 1 Treatment lasts until you dump tanks 1 Treatment lasts until you dump tanks 1 Treatment lasts until you dump tanks This is a one use total tank cleaner.
Septic Safe Not for home septic use.
Cleans Sensors
Helps Break Down Waste Solids Removes any buildup in holding tanks
Happy Campers Odor Free Holding Tank Treatment

A Note from Happy Campers about the Extreme Cleaner:

Much like clothes in a washing machine, rinsing & agitation does most of the work, EXTREME CLEANER simply softens & helps dissolve sludge & crud in holding tanks. Use an on-board or flexible down-the-toilet rinser for best results.

If your trailer/RV is not mobile:

Fill your holding tank as full as possible and add the entire container for treatment following step 3 above. Leave in your holding tank 24-48 hours before dumping.

Note: If you own an RV you probably know that holding tank sensors are historically temperamental, and even a little unreliable. Heavy cleaning will usually (but not always) restore scum-crusted sensors. Stationary units require more rinsing with less success. Will not dissolve “wipes” or fix broken or corroded probes.

*This product is not intended to be a regular holding tank treatment or deodorant - seasonal at most.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Price$38.45$34.97$23.49$23.49$17.99$21.99
Price Per Unit$2.14 / Ounce$2.91 / Ounce$0.73 / Fl Oz$0.73 / Fl Oz$0.56 / Fl Oz$1.37 / Count
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Easy to use
4.6
4.7
4.6
5.0
Scent
3.9
4.3
4.5
Sold By
RV CAMPERS
Doctor Pooper
Unique Manufacturing & Marketing
Unique Manufacturing & Marketing
TGW Company
Unique Manufacturing & Marketing
form
Granule
Powder
Liquid
Liquid
Liquid
Capsule
scent
Unscented
Fresh
Unscented
surface suggestion
Toilet, Sink
Toilet
Toilet
Toilet
Wall, Toilet, Drain
Toilet
volume
4 gallons
20 quarts
32 fluid ounces
32 fluid ounces
32 fluid ounces
165.24 cubic inches

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Customer reviews

4.4 out of 5 stars
4.4 out of 5
953 global ratings

Customers say

Customers like the smell of the product. They say it eliminates the smell. However, some customers feel the value of the cleaning agent is not worth the money. Customers also disagree on quality and sensor.

AI-generated from the text of customer reviews

38 customers mention29 positive9 negative

Customers like the smell of the cleaning agent. They say it eliminates the smell.

"...My gauges work, the odors are gone. Everything flushes EVERY TIME. I have not had a clog since using their products.All in all...." Read more

"...Dumped it. No tank odor and my gauges work!!..." Read more

"Does a great job killing the excess smell and you can tell they make a quality product. It's very easy to use with instructions" Read more

"...used a dump caddy with minimal fresh flushing of tank well it didn't smell to good ...." Read more

15 customers mention15 positive0 negative

Customers find the cleaning agent very easy to use and follow the instructions. They also say it works to clean tanks and sensors.

"...It was so easy, I am sure Hubby will have no problem keeping up with it." Read more

"...So happy we purchased this and used it. Great product and easy to use." Read more

"...It's very easy to use with instructions" Read more

"I like that the product is safe and easy to use. I live in my camper full-time and I’m very good about keeping up my gray and black water tanks...." Read more

196 customers mention134 positive62 negative

Customers are mixed about the quality of the cleaning agent. Some mention that it does a great job, while others say that it simply didn't work.

"...My gauges work, the odors are gone. Everything flushes EVERY TIME. I have not had a clog since using their products.All in all...." Read more

"...So happy we purchased this and used it. Great product and easy to use." Read more

"...The black tank gauge hasn't worked in years. Finally this summer it got to smelling, and I went looking for a solution to the problem...." Read more

"Works exactly as it's supposed to, well worth using a few times per year for a deep clean of your black tank" Read more

23 customers mention7 positive16 negative

Customers are mixed about the sensor. Some mention that it cleaned their black tank and fixed an issue with the sensors, making them more accurate. However, others say that it didn't help the sensors at all and that they were still messed up.

"...it and now, although the black tank is completely empty, the sensor says it's 45% full...." Read more

"...These sensors are notoriously unreliable and I don't rely on them...." Read more

"This cleaner is the best. It cleaned my black tank and fixed an issue with the sensors...." Read more

"...Then drove around for 2 hrs. Flushed black tank as usual, sensors still messed up. Will not buy again" Read more

40 customers mention8 positive32 negative

Customers are dissatisfied with the value of the cleaning agent. They mention that it's very expensive and not worth the money. Some say that the product has the potential of dumping money down the drain.

"...I thought it was a bit expensive, that's why only 4 stars." Read more

"...work eventually but appears to have the potential of just dumping money down the drain...." Read more

"...It will need flushing several times and this stuff wasn't cheap" Read more

"This product is worth the price. I have tried multiple products and this one is the best. Hands down!!!!!" Read more

It actually works
5 Stars
It actually works
After a lot of spraying with a wand into the tank and the built in sprayer, I managed to get our empty black tank to show only 3/4 full (3 lights) -- when it is empty! So I tried this Extreme Cleaner, followed the directions, drove around, left it overnight, drove more, and did a final spraying into the tank. When I drained it all the sensor lights went out except the bottom one indicating empty like it should, finally! Cool beans.
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Top reviews from the United States

Reviewed in the United States on May 26, 2021
25 people found this helpful
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Reviewed in the United States on September 13, 2017
36 people found this helpful
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Reviewed in the United States on March 4, 2024
Reviewed in the United States on March 6, 2024
Reviewed in the United States on February 2, 2024
Reviewed in the United States on October 10, 2023
One person found this helpful
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Reviewed in the United States on December 28, 2023
Reviewed in the United States on August 3, 2023
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Top reviews from other countries

Doug C
5.0 out of 5 stars This stuff works. Pricey but it works.
Reviewed in Canada on August 14, 2023
daniel
5.0 out of 5 stars Wonderful stuff
Reviewed in Canada on September 9, 2019
glen
5.0 out of 5 stars tank cleaner
Reviewed in Canada on August 15, 2019
Sandy
2.0 out of 5 stars One time use
Reviewed in Canada on September 3, 2019
One person found this helpful
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Joni
1.0 out of 5 stars Not worth the money
Reviewed in Canada on September 6, 2019
One person found this helpful
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