Something else to watch is cutting oils in the shop. If you are making smoke drilling, milling or on the lathe, keep your nose out of it. Possibly carcinogenic.
I know this post is a few month old But I just used a half a can of brake cleaner to clean the backing plates on my 64 wildcat front drums two night ago, i tried to remove the three bolt/nuts that attaches to the spindle unsuccessfully so penetrating PB blaster was aplied, no luck with a big hammer, my next option was my torch.. I was waiting to see if the pb blaster will finally work first.. In the meantime im reading this post and wow, Im sure glad i did. Now ill go look at ingredients. Seem to me that last year when i was rebuilding my 31 rear bango i used multiple sprays to loosen the drums on a donner rear end. One side had to be torch heated cherry red with puller to remove. Hell i haven't been the same since.
Almost made this mistake a couple months ago. I was sold Chlorinated brake parts cleaner and told it was non-chlorinated. got it home and started looking at the label. It contains Chlorine. Be careful of this especially with Generic Brake parts cleaner.