Please choose the correct ending to complete the given sentence: Home and Garden: [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.

Ending1: Be sure to check your products on a regular basis, as they can be harmful for you or others. Some products you should be aware of include : [substeps] Acetone furniture cleaner specialty bathroom cleaner dish soap pegboard plastic cleaner brush pipe cleaner [title] Scrape the sides of the toilet bowl. Ending2: [substeps] Look for a brand name printed or engraved on your toilet. Perform an internet search for " [your toilet brand] + safe cleaning products. Ending3: If you are in doubt about the product, ask your cleaner for further advice or ask your plumber or contractor to look it over if you don't have a knowledgeable opinion of its ingredients. [title] Scrub your toilet with a toothbrush. Ending4: Some items to review include : [substeps] Soap--this helps add moisture to your toilet bowl. If your toilet is dirty, be sure to clean it several times before flushing.

Answer format: ending1/ending2/ending3/ending4