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Wanted to post my results for others who might stumble across this looking for a cheap fix to the red slime problem common in these AF trucks. I dumped in 2 pounds of lye, (sold as drain cleaner at Lowes, Tractor Supply, etc) and added approx 30 gallons of water. Sealed up all openings, then put...

Just curious, what did that cost you?

So your saying that the fuel tank in my 87 M35A2c is not galvanized? Not mine personally but as standard work they don't galvanize these late model diesel tanks? Looks like your right. Evidently the diesel dissolves the zinc coating over time. Let the Lye treatment begin! This is the goop I...

Good point. Was going to use lye in mine this weekend, but guess I need to keep looking. Even though its not an acid it is a very strong base and would probably damage the zinc coating.

After doing some more research most people recommend acids such as vinegar, muratic acid, and citric acid for tank cleaning. I think this is mainly for rust issues, not the "gunk" we are trying to remove. Carb cleaner was also mentioned as a possible solution but they must have changed their...

I'm also going through this with a WR deuce right now. Got the tank drained and dropped, but with the baffles see no way good way to clean it. Is there any cleaning solutions that will cut this red crap? Then maybe set it in the back up my pickup for a couple hundred miles to let it soak and...