For all methods, wear gloves, use non-scratch cloths, sponges or scourers and rub or scrub in a circular motion (which seems to be more effective on soap scum). Repeat if necessary.
1. Orange oil
Apply in a circular motion and wipe away with a soft cloth.
2. Sodium bicarbonate
This method works for horizontal surfaces such as the bottom of baths and shower floors. Sprinkle the sodium bicarb on the soap scum with a touch of water. Scrub and rinse.
3. Laundry stain remover
Spray onto the soap scum. Leave for 15 minutes. Scrub and rinse.
4. Laundry detergent
Make a 50/50 paste of laundry powder and water. Work the paste into the soap scum and leave on for 15 minutes. Scrub and rinse.
5. Dishwasher tablet
Dip the dishwasher tablet into warm water and then rub into the soap scum and rinse.