To lubricate a stiff shower diverter valve, start by shutting off the water supply and removing the tub spout or diverter stem. Clean away any mineral scale crust using warm white vinegar. Dry the components completely, then apply a generous coating of food-grade silicone plumber's grease to all moving stems, O-rings, and sliding gates. Never use petroleum-based lubricants like WD-40, as they degrade rubber seals. Verification: Pull and push the lubricated diverter mechanism to confirm smooth, effortless movement.
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