If your kitchen faucet has become hard to turn, it is usually choked with mineral scale or lacking internal lubrication. Shut off the hot and cold water supply valves under the sink, remove the handle using an Allen wrench, and pull out the central cartridge. Soak the cartridge in warm white vinegar to dissolve calcium deposits, lubricate the rubber seals with waterproof plumber's silicone grease, and reassemble the handle securely. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Operate the faucet handle to confirm that smooth, effortless movement has been fully restored.
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