How to Clean a Faucet Aerator and Sink Sprayer
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Disassemble the aerator.
Push the internal parts out of the aerator housing. A small paper clip might help. If the components are stuck, soak the aerator in white vinegar or lime-dissolver solution (one part vinegar to one part water) for 30 minutes.
Tip: Cover the sink drain to prevent small parts from accidentally falling down the drain.