5 years later, replace the fuel tank or clean it?

I used Kreem in a bike that I built. I stretched the tanks so I put Kreem in the tanks to seal any possible holes from welding. Anyways I followed the directions to the T and I could never get the bike to run right. Well the Kreem feel apart and blocked the fuel lines and there was a bunch of kreem in the carb too. Maybe I had a bad batch. But, it was a PIA.