The strongest cleaners use ammonia or bleach to get rid of soap scum. However, these may not be safe for all surfaces, and require preparation and care when handling. Plant-based cleaners can also lift soap scum away with a foaming agent, and DIY options include baking soda and white vinegar to dissolve soap scum. Finally, some old-fashioned elbow grease can scrub away a layer of soap scum, although cleaning solutions make this task easier and more effective.