Use a “Jet Bottle Washer” and Bottle Brush – Used bottles frequently have clumps of mould in the bottom that can be difficult to remove. A “Jet Bottle Washer” washer is a device that screws onto the end of your faucet and has a valve on it that activates when you push the bottle over it. A bottle jet will make short work of cleaning most bottles. For stubborn sediment, a small bottle brush will remove the rest. Sanitise your bottles in a high quality sanitising solution before bottling.