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How to caulk the kitchen sink
Make sure the rim of the sink is clean and dry.
Remove any old caulk from the rim with a utility knife.
Cut through the old caulk and pull it free from the rim.
Clean up the area with a paper towel soaked in rubbing alcohol to remove any old caulk residue and to ensure a clean surface ready to accept new caulk. Let the sink's rim and counter edge dry completely.