I give put a few drops of mild washing liquid in them, then hot (not boiling, just hot enough you can touch it) shake to remove anything. Rinse and shake and repeat till no hint of suds are left then finally a little distilled water in each, or filtered rain water to finish it with a rinse out. Where I am the town water is treated and if you left a glass to dry on its own you will see white residue patches on the glass. If I never gave my bottles that final rinse then thats what id be vaping. Wash a glass in the water you use and let it dry by itself, dont wipe it, and see if your water leaves residues. Then you will know if you may need that final rinse out with a more pure one. Depends where you live I guess.How do you sterilise your bottles etc?
Currently I'm just washing up then rinsing in very hot water .. prob not the best, so was after some advice.