Vinegar is your best 1st attempt
If that doesn't work, it appears the black plastic ring surrounding the aerator screen has 2 sets of opposing slots, 90 degrees apart. A screwdriver flat blade in 1 of them and then unscrewing may allow disassembly, after vinegar soaking. There are specialized tools for this operation....pinch ring pliers come to mind might fit and work. Even a more specialized tool than that likely, somewhere, exists, I assume.
After that....you're on your own. If it's sand nuggets or other detritus clogging things, you'll need to remove that plastic ring.
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