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I have cleaned the inside of tanks using small pieces of chain or nuts and washers . put them in and keep turning the tank , no outside damage but removes most of what is in there . OLD SKOOL !!!
Agreed! I use 20ea. 1/4-20 nuts. Count them going in and account for all 20 when coming out. Shake and rattle, dump nuts, rinse inside of tank, clean the nuts and repeat til everything comes out clean.