I'm getting my ass whupped by a panel that is cemented with that damn stuff. I have about 8 pcs to replace in a full door panel.
A while back I asked Inland about what would soften or disolve that black concrete crap for repair work. They suggested a soak in linseed oil and if that didn't work, muratic acid.
I've tried ammonia, denatured alcohol, lacquer thinner, zylene, and am now soaking it with the linseed oil.
I wanted to use the muratic as a last resort, have you ever tried it? Precautions?
Any other suggestions?