have you looked into using muriatic acid? available as concrete cleaner from toolstation etc (I'm assuming you are looking at rust bluing/blacking) also hydrochloric acid
have you looked into using muriatic acid? available as concrete cleaner from toolstation etc (I'm assuming you are looking at rust bluing/blacking) also hydrochloric acid
You Cannot Reason People Out of Something They Were Not Reasoned Into
"Politicians like to panic, they need activity. It is their substitute for achievement" Sir Humphry Appleby