Step 1
Fill a spray bottle with full-strength distilled vinegar. Spray the sink generously with the vinegar, thoroughly saturating the soap scum residue.
Step 2
Let the full-strength vinegar permeate the soap scum residue for 10 minutes.
Step 3
Wipe the vinegar and loosened soap scum residue off the sink using paper towels. Clean off as much soap scum residue as possible.
Step 4
Inspect the sink for remaining soap scum residue too stubborn for vinegar to soften. If stubborn soap scum residue lingers, make a paste with 1 oz. of water and 2 oz. of baking soda. Mix the ingredients to smooth the paste.
Step 5
Smear the paste over the soap scum residue using a spatula. Keep the paste on the sink for 10 minutes.
Step 6
Wet a nylon sponge with water. Scrub the paste completely off the sink using the sponge.
Step 7
Dry the sink's surfaces thoroughly with a towel.