Use your beer glasses strictly for beer – never for soda, milk, iced tea, or other non-beer substances. Beer is an extremely sensitive fluid that reacts poorly with anything else. No matter how well you’ve washed your glasses, there is still a chance that residue will spoil the full flavor of your beer.
Do not wash beer glasses with soap or detergent of any kind. Use a solution of baking soda or salt and very hot water; then rinse with clean very hot water.
Sponges and dishcloths should be avoided.