What You Need:
1 empty plastic bottle (like a 1-liter soda bottle)
Hot water
Optional: dish soap
Steps:
Remove the stopper or strainer from the sink drain so the bottle can sit flush.
Fill the bottle with hot water (not boiling, to avoid melting the plastic).
Position the bottle upside down in the sink drain. Make sure the opening is tightly sealed around the drain hole.
Press down firmly and release repeatedly.
