Hummingbird feeders are especially vulnerable to bacteria and other unwanted pests. Clean your birdfeeders once a month and they will stay naturally healthy with our Cleaner. Keep out the bacteria and parasites that harm or kill the birds we are trying to attract. Can be used in birdhouses as well, whether plastic, wood, metal or ceramic. Our enzyme cleaners can safely dissolve residue and penetrate the dipper tubes - eliminate those rings and scum, leaving the glass or plastic squeaky clean.