Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean a bathroom sink drain [title] Remove debris from the drain weekly. [step] To prevent buildups, remove any pop-up stoppers or drain guards on your sink and discard the debris that they've collected. Rinse them before replacing them.

Ending1: [title] Decide on whether or not to use soap. [step] When washing steel sinks, be sure to use a mild soap that won't damage the sink. Ending2: [substeps] If you're using your faucet, fill a bucket with water and allow it to come to a full, low boil. Fill it several times if you're using an electric hot water source. Ending3: [substeps] Most bathroom sinks feature an adjustable metal stopper than can be used to plug the sink. These can be removed by pulling them out of the drain. Ending4: [substeps] The water that comes out of the sink drains into the toilet tank. Remove any drain guards directly after each use to avoid clogging up the sink pipes.

Answer format: ending1/ending2/ending3/ending4