As for brake clean, the only thing you have to worry about is cancer, and that is only if you live in CA. Rest of the country is tougher. I buy a few cans of this stuff at a time. I love it for cleaning concrete, gunked up parts. I have even used it guns.
I remember it ate up some of my tar driveway one time...
"enjoy every sandwich" - W Zevon
2001 FLHR (carb) w 95" 26g cam and a head job.