I use the Startron tank cleaner. I throw it into my jugs of WVO and Biodiesel ater they have gone through the final filter. That way I can pour straight from my 5 gallon storage jugs into my tank and not worry about it.

I mail ordered it from West Marine.

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.