Wear rubber gloves to protect your hands and arms when working with bleach. Wear old clothes or clothes that bleach will not damage.
Place a rag or towel on any carpet or rugs near the tub to prevent getting cleaning supplies on them.
Fill your bathtub with warm water. Add a cup of bleach and allow the mixture to sit for 20 to 30 minutes. Drain the tub and rinse the inside with water. Wipe your tub dry with a clean cloth. This will remove general soap and hard water stains.
Mix equal parts vinegar and water to clean hard water stains around the inside of your bathtub. Scour the tub with the vinegar and water using a scrub brush. Rinse the tub with water.
Mix warm water and baking soda. Place the mixture over any soap or hard water stains. Allow it to dry 2 hours. Scrub the water and baking soda paste off your tub. Rinse the tub with water and dry it with a soft cloth.
Clean the inside of your tub with a scrubbing disinfectant. Use a disinfecting detergent powder to wash your drain and the handles of the bathtub.
Cover any rust stains on the bottom of your tub with salt and squirt lemon juice over it. Allow the mixture to dry overnight. Wipe the salt and lemon juice mixture away with a damp cloth and rinse the tub with water.