Industrial Strength RV Tank Cleaner for Black & Gray Tanks
When regular treatments aren’t enough, Happy Campers Extreme RV Holding Tank Cleaner resets your system with a single, powerful deep clean. It dissolves stubborn sludge, restores tank sensors, and eliminates tough odors in both black and gray tanks.
Why Choose Our RV Tank Shock Treatment?
- Heavy-duty one-time treatment for deep cleaning
- Breaks down solid waste and sensor-clogging buildup
- Restores function to dirty tank sensors
- Compatible with black and gray holding tanks
- Safe for campground dump sites and RV plumbing
How to Use:
- Dump and thoroughly rinse your RV holding tank
- Mix entire container of Extreme Cleaner into 3–4 gallons of hot water in a bucket. Stir until fully dissolved
- Pour solution into the toilet (for black tank) or down the sink (for gray tank)
- Add 5–7 more gallons of water into the tank. If parked, fill tank completely if possible
- Drive your RV on winding or bumpy roads to agitate the tank and enhance cleaning
- Once you reach your destination, dump and rinse the tank thoroughly
Important Notes:
Agitation (via driving) and thorough rinsing are key to effectiveness — Extreme Cleaner loosens and dissolves sludge, but motion and water do the hard work. For non-mobile RVs, fill tank as full as possible and soak for 48–72 hours before dumping. Use a rinser for best results.
Sensor notice: While most sensors are restored with heavy cleaning, results can vary depending on buildup or probe condition. Product will not dissolve wipes or fix broken/corroded probes.
Looking for ongoing maintenance after a deep clean? Try our daily-use odor control treatments next.
This is NOT a regular maintenance treatment to control odor:
The Extreme Cleaner 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 and Can Be Use for:
USES:
1) Thoroughly Clean holding tanks
2) Cleans poor working sensors.
3) Softens & removes solid buildup like poop pyramids.
4) You just bought your RV & want to super clean the tanks for a fresh start.
5) A great product for an annual clean out, especially when winterizing.
*Recommended for use in 30-60 gallon tanks.
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Satisfied with the effectiveness of the product.
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Have not used
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Bought the Extreme cleaner for our grey tank because it worked 'extremely well' in our black tank.
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I purchased this to get my sensors in the black holding tank to work but it didn't help. However the water that came out was brown whereas it had been clear prior to using this product so evidently it did clean the tank but not affect the sensors
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We have tried every product you can think of to clean holding tanks and we have been trying for 20 years EXTREME is hands down is the best product we have found and I guess that's why it's been hard to get
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Absolutely positively the best tank cleaner ever made. After many other attempts to clean and deodorize my black tank HappY Campers Extreme did it in one try. I am now following up with with regular Happy Campers and have not had a single issue. My sensors actually work now too. I strongly urge you to use Extreme to get it cleaned right the first time.
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This is the second time I have used this product and I am very happy with it. Since I likely let too much "material" build up during the camping season, it is nice to have this product at the beginning and end of the season to do a thorough cleaning. Having a clean tank allows the Happy Camper treatment that they sell to do a great job keeping things clean. I like to use this product once a year to keep my black tank working well.
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I was dealing with a possible huge headache with my black tank as well as the usual issue of tank sensor problems. I used the Happy Campers Extreme product and then the regular Happy Campers. The black tank now runs clear and the sensors work! Thank you for a tremendous product!
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This stuff works amazingly well if you use it according to the directions it will clean out your tanks and get them ice cream is new.