Most of the carb / brake cleaners sold at parts stores in CA has had all of the volatile stuff removed from it so that can be sold in CA ,
Thank you EPA. So the cleaners now are not as strong and don't clean as well as they have in the past. Having said that I still would not use them near rubber components without testing first ,regardless of what the label does or doesn't say .
And as California does, so does the rest of the country after a few years. I wouldn't have thought about their less volatile requirements until I read your post.