I have given the most untamed chickens baths before. They usually dont fight it too much. You have to have control of their wings though. You could end up with a black eye if you dont. And you will want to trim their nails before you bathe them to minimize scratches. In the summer we would give them baths outside and put them in cages to dry outside under the trees. I have blow dried a few depending on the breeds. When I bathe them outside, I set up three tubs of warm water in a line, one for the initial wetting and soaping, one for the rinsing, and one for the final rinsing to make sure all of the soap is off. If they are white birds I have 4 tubs, with the third one being for adding bluing to the clean water to help them be whiter.
For some reason, they tend to want to put their heads in the water, so you have to be careful with that.