If you've tried various bathtub cleaning products, including bleach, and still can't remove the stains, it's possible that the stains are deeply embedded or are caused by something that typical cleaners can't handle. Here are some alternative methods you can try:
Baking Soda and Vinegar: Create a paste by mixing baking soda with white vinegar. Apply the paste to the stained areas and let it sit for about 15-20 minutes. Scrub the stains gently with a soft brush or sponge, then rinse thoroughly with water.
Lemon Juice and Borax: Mix equal parts of lemon juice and borax powder to form a thick paste. Apply the paste to the stained areas, allow it to sit for a few minutes, then scrub and rinse well.
Hydrogen Peroxide and Cream of Tartar: Make a paste by combining hydrogen peroxide and cream of tartar. Apply the paste to the stains, let it sit for a while, and then scrub and rinse thoroughly.
Magic Eraser: Magic Erasers are melamine foam sponges that can effectively remove stubborn stains. Wet the sponge and gently scrub the stained areas. Be sure to test on a small, inconspicuous area first to ensure it doesn't damage the surface.
Commercial Limescale Removers: Look for limescale or rust removers specifically designed for bathroom surfaces. These products might be more effective against tough stains.
Steam Cleaning: If you have access to a steam cleaner, it can help loosen and dissolve stubborn stains without the need for harsh chemicals.
Pumice Stone: A pumice stone designed for cleaning can be used to gently scrub away stains. Wet the stone and lightly rub the stained areas. Avoid using this method on delicate or easily scratched surfaces.
Remember, always wear appropriate protective gear, such as gloves and a mask, when using cleaning agents, especially if you're mixing different chemicals. Additionally, test any new cleaning method on a small, inconspicuous area of the bathtub first to ensure it doesn't cause any damage. If the stains persist and are severe, you may want to consider seeking professional help from a bathroom cleaning or renovation service to address the issue.