How to De-Winterize Your RV Tanks for Spring

Quick Answer: When de-winterizing your RV, deep-clean both the black and grey holding tanks using enzyme-based treatments. This removes residual buildup, eliminates odors, restores sensor accuracy, and prepares your system for summer travel.

Why Spring Tank Cleaning Is Important

After months in storage, waste residue, grease, and odor-causing buildup can remain inside your holding tanks. If not properly cleaned, this buildup can cause:

• Persistent odors
• False sensor readings
• Slow drainage
• Valve and seal issues
• Clogs from hardened waste

A spring deep clean ensures your RV is road-ready and odor-free.

How to Clean Your RV Black Tank After Winter Storage

For black tank cleaning, use a concentrated enzyme treatment such as Commando.

Why Enzyme Cleaning Works

Enzymes break down organic waste and toilet paper stuck to tank walls and sensors. This residual buildup is a common source of foul odors and inaccurate level readings.

How to Use a Black Tank Cleaner

1. Empty and rinse the tank.
2. Drop one pre-measured packet into the toilet.
3. Fill the tank above sensor level.
4. Let sit for 12–24 hours (longer for stubborn buildup).
5. Dump and rinse.

In many cases, this restores sensor function without scrubbing or agitation. For preventative maintenance, repeat every three months.

How to Clean Your RV Grey Tank After Storage

Your grey tank collects water from sinks and showers, which leads to grease, soap residue, and organic sludge buildup over time.

Elemonate is designed specifically for grey tank sanitation and drain line maintenance.

How to Use a Grey Tank Treatment

1. Drop one tablet into a sink drain.
2. Run water briefly to dissolve.
3. Allow time for enzymes to break down grease and sludge.
4. Empty the tank fully.

Regular use helps keep drain lines free-flowing and odor-free.

Spring RV Tank Maintenance Checklist

• Deep-clean black tank
• Restore sensor accuracy
• Clean grey tank and drain lines
• Lubricate valves and seals
• Eliminate residual odors before travel

Bottom Line

De-winterizing isn’t just about refilling water lines—it’s about starting the season with clean, properly functioning holding tanks. Using enzyme-based treatments simplifies the process and helps prevent odor and performance issues during peak travel months.

Happy Adventuring!