Just so you know, if you're only changing out the pads, there is no need to remove the caliper. Let the bike sit as long as possible (as in, don't squeeze the brake lever before you change pads) to let the pads fully retract. Then just remove the center bolt and spring clip. The pads will slide out and the new ones can be installed. You can still use cleaner to spray everything clean if you want before installing the pads.
I’ve never tried that but I don’t think my calipers retract enough (or at all) even after days of the brake lever not being pressed. Either way, I like to wipe all the brake dust off the pistons with a cloth after spraying brake cleaner. That’s hard to do if the calipers aren’t taken off the brake disc :)
