Before you reach for the harsh chemical cleaners (you know, the ones that burn your nostrils and warn you not to touch the bottle), step away from the cupboard.

This reaction produces rapid bubbling and fizzing. The expanding gas bubbles build pressure inside the pipe, physically loosening grease, hair, soap scum, and organic debris stuck to the drain walls.

For tough grease, mix 1/2 cup of table salt with 1/2 cup of baking soda before pouring it down the drain. Salt acts as an extra abrasive agent to scour away heavy grease. 2. The Bathroom Shower and Tub (Hair and Soap Scum)