Try this natural cleaner to get rid of stains, soap scum, grime, mold and mildew. Add one cup of baking soda and several drops of an antibacterial essential oil (such as tea tree, eucalyptus, rosemary, or peppermint). Add just enough water to form a paste. Let the paste sit for 15 minutes, then wipe and rinse. Use a sponge or brush to scrub the bathtub surfaces.
Bath Tub Cleaning Spray:
Add 10-20 drops tea tree oil with 1 cup water — in a spray bottle. Spray the tub surface, let stand for 15 minutes, then wipe with a microfiber cloth or sponge. Rinse with clean water and wipe again. A natural antiseptic and fungicide, tea tree oil will kill the mold and help prevent growth.