Yes I use it for washing the drinkers ,but also for the birds to drink,soft bleach you get it at the supermarket for pennies,must be measured properly ,Type into search ,Pigeon Medicines then scroll down to web,then click on (Your medecine cabinet)by pigeon networks,an article will appear by Dr David Marx ,click onto (The Miracle Of Chlorine) and all will be revealed .You can also read his other articles for all you ever need to no ,Merry Xmas .