Quoted from kirkgun:

Brake cleaner will do an excellent job of cleaning dirt and grease from metal parts.
I wouldn't spray it anywhere near a pinball machine (or indoors anywhere). It will also destroy/degrade rubber, plastic, paint and most other synthetic materials. Dudes who don't know what they are doing ruin the seals and rubber dust boots on their brakes, all the time. 6 months after "cleaning" their brakes, they are rebuilding/replacing leaky calipers.