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Water valve under sink won t shut off.
If there s buildup visible on the water valve pour a little white vinegar on the valve and scrub the buildup away with a wire brush.
Place a folded piece of paper towel on the adjustable wrench jaws or wrap it around the shutoff valve prior to moving.
First make sure that you shut off the water that supplies the valve you re going to be working on.
If the valve won t turn off the water or shut off completely it is likely tha.
A water supply valve that won t work or leaks when it is shut can be repaired.
Prevent shutoff valves from freezing or becoming stiff by turning the valve on and off twice a year.
This tip if followed will work 85 percent of the time.
Otherwise you ll might find yourself dealing with a much larger problem that your initial one.