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If you wanted to do a really fast cleaning, you could stick the largest allen key you can fit in the smaller slot of the caliper, and it should be enough that none of the pistons will pop out. See 3rd, 4th, and 5th pictures from bottom: If you look at the caliper front to back, the top half is narrower than the bottom half. The size of that gap depends on brand, but it's usually somewhere around 3-4mm.
I find this trick works to get all the pistons out relatively quick, even if they don't move at first, because the other ones will stop once they hit the allen key and the only thing that's left to move is the sticky piston. Only tricky part is pushing the pistons back in since a tire lever usually won't fit. I've used the same allen key by rotating it 90 degrees then pressing on both ends. Haven't cracked any pistons as of yet, but ymmv.
You can also use this technique with pads installed as a way to narrow the gap while maintaining alignment, and then make minor adjustments by hand once you fit the rotor in.
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