To get it off the stone, I use the dressing tool that I normally use on the bench grinder.
Side note: I've been told that grinding aluminum on the bench grinder can be dangerous to the wheel and cause it to fracture.
Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~
Airco 300 - Syncro 350
Thermal Arc 161 and 300
Tried being normal once, didn't take....I think it was a Tuesday.