To fix a sticking or clogged sink sprayer diverter valve, start by shutting off the hot and cold water supply valves under the sink. Depending on your faucet model, unscrew the spout tip or remove the handle cartridge housing to access the internal diverter valve. Soak the valve components in white vinegar to dissolve hard water mineral scale, or replace the worn diverter assembly with an exact-matching replacement part. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before beginning repairs. Verification: Reassemble the valve and test water flow to confirm it switches smoothly between spout and sprayer.
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