I am the second owner of a 2005 Fleetwood Southwind. I suspect there is some sludge or grease buildup that causes the gray tank to drain slowly. Can anyone recommend something to break it up?
There is also a drain cleaner that I bought at Home Depo years ago that is organic non-caustic and is made for breaking up grease and goo. Won't hurt plastic or anything and it wouldn't hurt anything to dump a bottle of that in the tank and let it sit for a day or two.
Probably a grease and food particle buildup if your kitchen sink drains into that tank.
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