They seldom fight bad enough to cause either of them harm. Hummingbirds enjoy grooming themselves. They use the oil from the gland near their tail. They use this oil on there wings, stomach, tail feathers and back. They use their claws to comb their heads and necks.
Hummingbirds also enjoy the sun.
You can see they laying out sunning their breasts. If a hummingbird needs to get clean, they may use a shallow pond, or rain or a sprinkler that maybe watering flowers. They dip their chins and bellies in the shallow pond. If it is raining, they will get soaked and get clean everywhere easily. Hummingbirds do sleep in a position with their neck retracted and their head forward.