[header] How to clean a stained toilet bowl [title] Check your manufacturer's instructions. [step] Before you begin cleaning your toilet, it is best to check your manufacturer's instructions. Certain products can damage the inner-workings of your toilet--such as the flapper--while others may cause discoloration. 
[substeps] Look for a brand name printed or engraved on your toilet. Perform an internet search for " [your toilet brand] + safe cleaning products.