fuel bladder tank

I bought an older 21' double eagle that has sat for 10 years with roten fuel that's turned into a thick sludge on the bottom of the tank, is there anyone on this site with any experience on cleaning out this sludge? I've tryed acetone but there's still tar goop left . I've flushed close to 100...

I bought an older 21' double eagle that has sat for 10 years with roten fuel that's turned into a thick sludge on the bottom of the tank, is there anyone on this site with any experience on cleaning out this sludge? I've tryed acetone but there's still tar goop left . I've flushed close to 100...

Selling for a friend of mine. Unit is in excellent shape. Has previously been used for diesel fuel and can hold gasoline as well. He has never used it, and prior boat owner used it only a couple of times. Comes with tie down straps and carrying bag. Can ship it to you as it rolls up into a...