So I was planning on cleaning and coating the inside of the gas tank on my 41 chevy. I finally pulled the float off and dumped the gas out. No leaks in the tank and I found out the inside looks really good. A little rust/crap in the middle bottom of tank otherwise clean metal. So my question is if I am not going to coat the inside of the tank, what is the best way to clean it? I have heard diluted muratic acid but also heard worries about it "etching" the metal and leaving a surface that is prone to rust.... Any thoughts?