To clean a stuck shower diverter valve and restore normal operation, start by shutting off the water supply and unscrewing the tub spout or pulling out the diverter stem. Submerge the component in warm white distilled vinegar for 45 minutes to dissolve hard water calcium and lime crust. After descaling, rinse thoroughly, apply a generous coating of food-grade silicone plumber's grease, and reassemble. Verification: Pull and push the diverter mechanism to confirm it moves freely and seals tightly.
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