To lubricate a faucet cartridge correctly, start by shutting off the water supply valves under the sink and opening the handle to relieve pressure. Remove the handle and pull the cartridge straight out of the faucet body. Wipe away any old debris and mineral scale, rinse the cartridge clean, and apply a thin, even layer of waterproof silicone grease (plumber's grease) all over the outer O-rings and moving stems. Reinsert the cartridge and reassemble the handle. Verification: Test the handle movement to ensure it glides smoothly without binding.
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