Why Does My RV Still Smell? Common Odor Sources and Solutions

Quick Answer: If odors linger in your RV even after using a black tank deodorizer, the source may be your grey tank, interior air, or hardened black tank buildup. Targeted treatments for each odor source provide complete odor control.

Odor Source #1: Grey Holding Tank

Many RV owners focus only on the black tank, but the grey tank can also produce strong odors. Grey tanks collect water from sinks and showers, which contains:

• Grease and cooking residue
• Soap scum
• Food particles
• Organic sludge

Over time, this buildup can generate unpleasant smells.

Solution: Grey Tank Enzyme Treatment

Elemonate is designed specifically for grey holding tanks. The quick-dissolving tablet contains enzymes that break down grease and sludge while releasing a fresh lemon scent.

To use:

1. Drop one tablet into the sink drain.
2. Run water for several seconds to dissolve.
3. Allow enzymes to work inside the tank.

Odor Source #2: Interior Air (Mildew, Trash, Laundry)

RVs are compact spaces, which means odors from garbage, damp towels, or pets can quickly become noticeable.

Solution: Air Odor Neutralizer

Odor Absorber is a charcoal-infused gel that traps and neutralizes airborne odor molecules. Once opened, it works continuously for up to 60 days.

Common placement areas include:

• Under the sink
• Inside trash bins
• Near laundry storage
• In storage compartments

Odor Source #3: Black Tank Buildup (“Pyramid Plug”)

If black tank odors persist even when using deodorizer, hardened waste buildup may be the problem. This often happens when insufficient water is used, allowing solids to accumulate and cake onto tank walls and sensors.

This buildup can:

• Trap residual odor
• Cause false sensor readings
• Restrict proper tank flow

Solution: Deep Black Tank Cleaning

Commando is a concentrated enzyme cleaner designed to break down hardened solids and restore tank performance.

To use:

1. Empty and rinse the tank.
2. Add one packet and fill the tank with water.
3. Let sit for 12–24 hours (longer if needed).
4. Dump and rinse again.

The enzyme formula works without scrubbing to clean tank walls and sensors.

Complete RV Odor Control Strategy

• Treat black tank regularly
• Maintain grey tank with enzyme tablets
• Use adequate water after dumping
• Neutralize interior air odors
• Deep clean periodically

Bottom Line

If your RV still smells, the issue may not be your black tank deodorizer—it may be another overlooked odor source. Targeting each source individually ensures a fresher, more comfortable travel experience.

Need Help? Call 800-338-3155 or visit your local RV dealer for product guidance.