Please choose the correct ending to complete the given sentence: Health: [header] How to clean a glass pipe [title] Remove any loose gunk from the pipe. [step] Hold the pipe upside down and gently tap to remove any remaining particles. Then use a pipe cleaner, cotton swab, mechanical pencil, needle, or similarly thin object to remove any large, easily dislodged bits of resin you can reach.

Ending1: [substeps] Don't risk breaking the pipe to get at tough spots, as you only need to get anything big and easy to reach off now. This will help the alcohol clean the rest of the pipe faster. Ending2: [substeps] If you're worried about loosening the resin trapped within the pipe (and you must handle resin alone, if possible), consider replacing the pipe with a screw-driver. These can be found at most hardware stores or in kitchen-supply stores. Ending3: Watch for changes in the substance as you clean. [substeps] Taking breaks will also help avoid jarring the pipe. Ending4: This can be difficult to do with any standard pipe cleaner, but with a bit of eye cleaning, you can clear any loose bits of resin that you find. You may need to use a brass or glass magnifying glass to do this.

Answer format: ending1/ending2/ending3/ending4