There are a variety of surfaces that toilet bowl cleaner tablets can be used on. These surfaces include but are not limited to porcelain, stainless steel, chrome, and plastic. It is important to read the label of the cleaner before use to ensure that it is safe for the intended surface.Some cleaners are specifically designed to clean one type of surface while others are more versatile and can be used on multiple surfaces. When it comes to toilet bowl cleaner tablets, it is best to go with a cleaner that is versatile and can be used on multiple surfaces. This will help reduce the number of different cleaners that need to be stored in the home.It is also important to keep in mind that not all surfaces are created equal. Some surfaces may be more sensitive than others and may require a less powerful cleaner. In general, though, toilet bowl cleaner tablets are safe to use on most surfaces.