howdy all i gots me a question.a coworker asked ne this question today and i had no anwser so thought i would post it here.she recieved an old aluminum boat which has i guess a steel tank in it.whe says there is rust in the tank and would like to know the best way to remove it.she had mentioned that she thought she knew of some kind of chemical that would do the trick but couldnt remember the name of it.but all ideas are welcome at this point.dont think she is in a hurry to get it done just want to do it wiht the least amout of physical labor involved.ty in advance