I buy baking soda by the 10 lb package........I get into the shower putting a mat down so I don't slide. take about 8 oz of dry baking soda. use a sponge......wet the area that you are going to work in start from the top down and add dry baking soda to the wets sponge. This gets it super clean.........when you are done do the tub and then rinse it off with warm water. This will make it very shiney and every time you shower just rinse off the soap.