Mineral deposits in the aerator can rob a sink sprayer of its power. Unscrew the aerator from the sprayer and scrub it out with a toothbrush, then soak it in vinegar overnight. If that doesn't solve the problem, turn off the water to the fixture and remove the faucet handle and spout. Inside the faucet body, you'll find a small, round diverter valve. Scrub that valve with a toothbrush, coat new O-rings and washers with heat-proof grease, and reassemble the faucet.
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