How to Scrub and Clean a Bathtub

Remove everything from inside the bathtub; wipe down all the items that you remove.
Begin with the tub surround; the walls above and around the tub are the first things to clean. If your grout is mildewed and dirty, you’ll need to begin by using a tile cleaner and grout brush. Work from top to bottom. Fully rinse away any tile cleaner residue. Spray down the walls with an all-purpose cleaner, or cleaner that’s formulated for your tub surround. Wipe down the walls thoroughly, paying special attention to any sticky or obviously dirty areas. Be sure to ventilate the area with an open window or fan if your cleaner is bleach based or has any other strong scent.
Apply an all-purpose or tub cleaner to the interior of your bathtub; letting the cleaner sit for 3 to 5 minutes will allow it power through much of the grime. After 3 to 5 minutes begin working from top to bottom wiping down the tub. Be sure to rinse this area thoroughly.
Tackle soap scum; using an old toothbrush or other small cleaning brush, begin scrubbing the corners where the tub meets the wall. Watch out for other places where soap scum has been collecting. Take the time to gently scrub it away.
Tackle ring around the tub; a stained ring may form around the interior of the bathtub. This will need special attention with a scrub brush and cleanser. Rinse thoroughly.
Wipe everything down again one last time; dry out the bathtub by wiping it down with a clean towel or cleaning cloth.This is important to make sure no water spots or residue remain in the bathtub.