Yes, you can clean a faucet aerator without fully removing it if it is difficult to unscrew, though it requires a bit of improvisation. You can fill a small plastic bag or balloon with white vinegar, secure it tightly around the end of the faucet spout using a rubber band or twist tie, and let the aerator soak submerged in the vinegar for at least one hour to dissolve exterior mineral scale. Verification: Remove the bag, turn on the water wide open, and check that the water stream flows straight and strong.
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