03-25-2009, 05:01 PM
Generally that would be muriatic acid, which removes the lime and any crud that's stained it, or to open up the surface for a stain or paint.
I think there is a substitute that's a little safer, but if outside the muriatic isn't so bad with caution.
I think there is a substitute that's a little safer, but if outside the muriatic isn't so bad with caution.
Gordon J Tilley