can you clean a fuel tank?

I had a customer that used a fuel tank sealer and after abut a year of use the sealer started to break down and he spent months chasing fuel clogging issues. Finally he ended up replacing tank, all fuel lines, pump and had to rebuild carb. After seeing his mess I would not even consider a sealer. Although I have never seen anyone else have the same issue I wouldnt even consider going that way. New tank for me even if it is expensive. Oh, his sealing kit was from eastwood.
Best of luck.
Rod