Those Porsche logo's are cast into the caliper. Simple green, engine cleaner, purple stuff, all work about the same. Might want to get a brass or stainless wire brush to get in the nooks and crannies.
If you are going to paint them, you might need to take the clear coat off the calipers first, use aircraft stripper for that, gloves, safety glasses, and lots of water. Plug the brake lines before you clean them.
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