First, choose the product you want to use. Cleaning aisles sell a plethora of shower cleaning and sanitizing products. However, you can also use a vinegar and water solution. After choosing your product, spray down the entire shower/bath area and let the product sit for about 20 minutes. Then, use a sponge to scrub the area. Fill a bowl with hot water and dip the sponge in and rinse it out to work efficiently. Use an old toothbrush or a grout brush if your shower area has built up grime in the tile or shower tracks, etc.