4 piston calipers question

So a quick update on my caliper project.
I pulled just the drivers side and used the grease trick, and all 4 pistons came out pretty easily.
Tge good news is that the cylinder bores, and the pistons are in great condition. The rubber boots have some small tears and nicks so I will definitely need to replace those at a minimum.
I will need to pull the pass side next but if that caliper is in the same shape I think I will be in great shape to easily rebuild them.

A couple of questions I have are, what is the best way the fully clean the caliper sides of the grease that I used to pump the cylinders out, and secondly what wilould I need to do to the caliper bores and pistons in prep for the rebuild; do I need to hit them with some emery cloth or anything like that to ensure the surfaces are perfect?