Soap scum is an accumulation of minerals from water, bacteria, dirt, body oils and sloughed-off skin. The best way to keep soap scum off shower doors is to wipe doors dry after every shower. If you don't have time to do that, wipe the doors often with a little lemon oil to keep scum from accumulating. If scum does form, there are several ways to get rid of it. There are many commercial cleaners on the market that will do the job. If you prefer a natural alternative, there are many of those, too.
Fill a spray bottle with white vinegar. Generously mist the glass or plastic shower doors.
Dampen a clean, soft rag with white vinegar and rub the soap scum off the surface.
Thoroughly rinse the doors with warm water and dry thoroughly to avoid water spots and stains.
Coat the shower door surface generously with white vinegar for hardened soap scum build-up.
Sprinkle non-abrasive baking soda generously over the vinegar. The chemical reaction between the white vinegar and the baking soda will bubble away the soap scum.
Rinse glass shower doors thoroughly with water. Dry the doors to avoid spots. .
Clean shower doors with lemon furniture oil. Apply oil with an acrylic scrub pad in a circular motion.
Wipe oil off with a soft cloth. Old T-shirts and cotton diapers work well.
Pour Borax on a sponge. Add a touch of water and scour the loosened soap scum away.
Rinse the shower doors well, using a sponge to remove all the soap scum residue.
Pour hair shampoo on a sponge. Rub it on the shower doors and let sit for 10 minutes while the degreaser dilutes the soap scum.
Scrub the soap scum away with a scratchy, acrylic pad.
Use Goo Gone if you have hard water, to remove the calcium and minerals along with soap scum from the surface.
Use ammonia for extreme build up of soap scum. Wear protective gloves.
Add ½ cup of ammonia to a gallon of water. Mix and put in a spray bottle.
Spray on shower walls and wipe the scum off with a scratchy pad.
Rinse thoroughly to remove ammonia from the walls and tub.
Use liquid soap for the shower, it doesn't adhere to surfaces when dry.
Don't apply lemon oil to shower floors. This can make them slippery and cause falls.