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I use the Kean Kanteen and it has that top that has the loop which happens to be hollow so I just put hot soapy water with a tbls. of bleach and screw it on and upend it so that the bleachy soapy water is inside the lid. I leave it for a bit then rinse the top well and scrub the bottle with a bottle brush.
How to build a DIY Micro Camper