28sawrig
Well-known member
Muriatic acid works for rust clogged radiators too, I put in about a Qt in 1/2 to 3/4 full radiator, run 20 minutes then flush, the inside looks like new and you wouldn't believe how much rusty crap comes out. Sheetrock screws work great in gas tanks to loosen up the rust, their very pointed and sharp edges and harder than woodpecker lips.