Re: gas tank crud

[Tubs]

quote amuller:

There is crud and there is crud.

Yep. Gunk left from old oil and fuel will likely respond
to a solvent base solution while rust or aluminum corrosion
is a result of moisture so a water base solution should
produce some results. As its rarely just one or the other
and the percentage of one to the other varies, what works
great one time can do little the next.

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.