I'm a novice brewer on a tiny island in the Pacific. Bottles are not easily accessible here, so I try to clean and re-use as much as possible. I always rinse right after using, but I've got about a dozen 22's with some sediment stuck on the bottom. I've tried soaking them in cleansers, hot water, and bleach, but they are still stubborn. The bottle brush sucks because there are no bristles on the tip. I've even tried using a wire clothes hanger to scrub the bottom without much success. I've seen a few "bristle-tipped" or "cotton-tipped" brushes online, but haven't bought one yet.