This question is going to reveal how "green" I actually am. I understand there are shaving creams that contain chemicals which could damage your brush if you use them. I have always understood these to be the creams one would typically used when saving with a disposable razor. In other words the creams sold in an aerosol cans. This leads to my two questions:

1) Is my understanding/assumption correct about the potential damage of aerosol creams?
2) Besides aerosol creams are there any other soaps/creams one should avoid using with their brush?

Looking forward to hearing your responses.

Jason