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Old 05-21-2013, 05:18 PM   #1
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Posts: 286
Grey Tank Cleaning

How do you clean out your grey tank? My tank level indicator was stuck at 1/3rd even after I emptied it! I flush the tank several times, but nothing worked! Now it's stuck at 2/3rds when emptied! I believe there is a solid build up on the sensor sidewall of the tank. What is the best method to get the tank clean?

Thanks for any info or suggestions

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Old 05-21-2013, 05:29 PM   #2
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Winnebago Owners Club
Workhorse Chassis Owner
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Location: Sonoma County, CA
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I drain, fill with about 10 gallons or so, add a 1/2 cup of Dawn dish detergent and then drive. As soon as we arrive at our new destination I drain the tank again. I use this method every 2 or 3 months.

Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination 39W Gas UFO Workhorse Chassis
Making the Journey in our Destination

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Old 05-21-2013, 05:31 PM   #3
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Location: Cincinnati
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I'd try the GEO Method first, followed by a good dose of Dawn dishwashing detergent to help cut the grease. You could do the GEO method, then the detergent. I'd suggest a bag of ice, but I don't know how you'd get it in the grey tank.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 05-21-2013, 05:33 PM   #4
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Location: Squaw Valley, CA / Fairhope, AL
Posts: 311
As said the Dawn and driving works well, there is some commercial products out there.
1995 Thor Residency 36', Chromolusion Paint, 460 Ford, Gale Banks Power Pack, Ported and Polished Heads, BBK Throttle Body, ECM Program & 1996 Coleman Shenandoah 25' Pop-Up
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