RV Holding Tank Cleaner – Restores Tank & Sensors

Heavy-Duty RV Holding Tank Cleaner for Black & Gray Tanks

When regular treatments aren’t enough, Happy Campers Extreme RV Holding Tank Cleaner provides a one-time deep cleaning process designed to loosen stubborn buildup, restore tank sensors, and remove the sources of persistent odors in both black and gray tanks.

Why Choose Our RV Holding Tank Deep Clean & Reset Treatment?

• Heavy-duty, one-time deep cleaning treatment
• Loosens compacted waste and sensor-fouling residue
• Helps restore function to dirty tank sensors
• Compatible with black and gray holding tanks
• Safe for RV plumbing and campground dump systems
• Please Take a Look at our Total Tank Reset Guide

How to Use:

1. Dump and thoroughly rinse your RV holding tank
2. Mix the entire container of Extreme Cleaner into 3–4 gallons of hot water in a bucket and stir until fully dissolved
3. Pour the solution into the toilet (for black tank) or down the sink (for gray tank)
4. Add an additional 5–7 gallons of water into the tank; if parked, fill the tank as full as possible
5. Drive your RV on winding or uneven roads to help agitate and loosen buildup
6. Once you reach your destination, dump and rinse the tank thoroughly

Important Notes:

Agitation (via driving) and thorough rinsing are key to results. Extreme Cleaner works by loosening and dissolving accumulated residue, while water flow and movement complete the cleaning process.

For non-mobile RVs, fill the tank as full as possible and allow the solution to soak for 48–72 hours before dumping. Use a tank rinser for best results.

Sensor notice: While many sensors regain proper readings after heavy cleaning, results may vary depending on buildup thickness or probe condition. This product will not dissolve wipes or repair broken or corroded probes.

Looking for ongoing maintenance after a deep clean? Try our daily-use odor control treatments next.

This Is NOT a Regular Maintenance Odor Control Treatment

Extreme Cleaner is designed for situations where buildup and residue have accumulated beyond what routine treatments can address. It focuses on deep cleaning through dissolution, soaking, and flushing — not daily odor maintenance.

We recommend observing what exits your holding tank during the dump process, even if the tank appeared clean beforehand — the results often reveal hidden buildup.

The Extreme RV Holding Tank Cleaner Is Easy to Use and Can Be Used For:

USES:

1) Thoroughly cleaning RV holding tanks

2) Improving sensor accuracy by removing residue buildup

3) Softening and removing compacted waste deposits

4) Resetting tanks after purchasing a used RV

5) Annual or seasonal deep cleaning, including winterization prep

*Recommended for use in 30–60 gallon tanks.