Cleaning a Stainless steel petrol tank

Hi chaps,
Best way to degrease/clean/remove residue from inside my tank please. Apparently according to Ben at A.F Rayspeed its polishing compound in my stainless tank that's nackered my piston
Cheers Nigel
Best way to degrease/clean/remove residue from inside my tank please. Apparently according to Ben at A.F Rayspeed its polishing compound in my stainless tank that's nackered my piston
Cheers Nigel