human
What is the best type of abrasive to use to clean my bathtub?
assistant
The best type of abrasive to use to clean your bathtub will depend on the surface material and type. For a smooth, non-porous surface such as tile or fiberglass, a coarse grit (60-120) sandpaper can be used. For a more textured surface like porcelain or enamel, a fine-grit (180-400) sandpaper may be better suited. Additionally, you could also consider using an aluminum oxide paste for a tougher, more resilient finish.