i'm wondering if using muriatic acid to de-rust a gas tank has any negative effects? i know all the info about not letting the acid touch the aluminum petcock or any rubber or plastic...but is there anything to be wary of as far as the actual tank is concerned? i've used the stuff for cleaning out one tank and it seemed to be fast and effective, and have had no ill consequences so far...just not sure if i should make a habit of it. any suggestions would be nice. thanks, y'all.