If a plumbing nut under your sink or on your faucet assembly is stuck due to corrosion or hard water scale, start by shutting off the water supply. Spray a penetrating oil or white vinegar around the threaded junction and let it sit for 15 to 20 minutes to break down the crust. Use a properly sized adjustable wrench or basin wrench, and tap the wrench handle gently with a hammer to shock the threads loose. Callout type="warning" title="Hygiene Warning": Wear safety glasses while working underneath the sink to protect your eyes from falling debris. Verification: Turn the nut counterclockwise with a wrench to confirm it breaks free from the threads.
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