Well, those of us who show wash our birds no matter the weather. I have ten looking forward to a bath (yeah, right) for a show next month. I set up some of those big dog carriers ahead of time, and I have a blow dryer for each cage that is propped against the door to blow around the top of the cage. I have a stack of towels, one for each bird, standing by the sink, and a towel in each cage. Make sure the dryer is on cool or warm - not hot! After I wash each bird, I wrap it mummy style and lay them down in a row in a long under-bed box, one right after the other. I keep their heads covered with a flap of the towel to keep them from looking around, but open enough so they can breath. They all pass out after a bath - the shock of the indignity, I think. After about twenty minutes they start waking up, so I unwrap them and stick them in a cage with the blower on while I keep bathing. I can fit three LF in a big cage at a time. By the time I am done bathing the last one, the first ones are usually ready to be finished. I take them out one at a time and blow dry them. Make sure when you do this that you keep the dryer moving at all times! You don't want to burn their skin!. I usually have my hand moving between the dryer and the birds, anyway, using my fingernails to separate the wet feathers that have clumped together. Make sure that they are completely dry before you put them back outside. Depending on how many birds you have, this can be an all-day job. I find I get as wet as they do, so I don't do this often. I use regular shampoo and conditioner on the birds, although I am experimenting with various whitening products for my white birds.
Welcome to the world of chickens!!
