Chris, this will be my 4th time doing caliper rebuilds. I use a scotch brite pad to clean the inside of the caliper. To remove the pistons I do use compressed air. But I reinstall the first piston just barely. then use a large C clamp to hold it in while I pop the other piston out. It is also wise to wear a visor type face protector because when the piston does pop out, it sprays a mist of residual brake fluid everywere. I also cover it with a shop rag to prevent this.
I'm just glad I don't have 6 piston calipers. Canyou imagine the rebuild on those?
