I am pretty sure the neighbors see ok, they just believe in letting the chickens be chickens. They feel if they are laying they are ok. I will try and get some Nu-stock on the legs. I have a full bag of DE and poultry dust. I think I will dust the nest area and put some new straw down. We don't trade chores. Just collect eggs and let birds out in morning and lock up at night.I wash my shoes off before coming back into my backyard. The hard part is that the chickens are not used to being handled, and they have light on in coop 24/7.That is pretty tuff. Doing for a neighbor is a good thing. Start a wood fire and make a little dusting area, and use some Nu stock on the legs. Perhaps you could pick up a bail of hay for yourself and bring half to their coop and spread it on top,stir it up a bit. People our age do not see as well as you young people do and we appreciate a helping hand. if you completely change things they might be offended. If you do little things they might be appreciative. Use your good judgment and it should work out great. If they have leg mites you are probably bringing them home to your birds. It would be a good idea to get rid of them if it is a practice of yours to trade chores. Spray neem oil on all roosting areas. I am sure they would love for you to spruce things up a bit.
The white wash is a good idea, but a little too invasive. Pretty sure they would take offense to that. But replacing the nest and litter materials and dusting is something I can do without upsetting them. I will do the nu-stock too. We don't get paid for it, just collect the eggs.This ain't non of my concern but I will say what I would do. Take some nu-stock over and put on legs. three days later I would do it again. At that same time I would clean the coop and white wash it.
White wash (My recipe)
In a five gallon bucket
1 gallon barn lime
!/2 box mule team borax.
Hot water till it is thin enough to paint with.
2 cups salt dissolved in hot water.
Stir every thing together
Let set over night for at least 12 hours
Stir again add more water if it needs it to paint with.
Put on old, old cloths and a pair of safety goggles not glasses.
Take a 6 inch paint or dry wall brush slop the white wash on with a painting motion, Get it everywhere roost in the cracks all over the walls. No need to be neat you will see why after it dries. Reapply litter same kind they had before.
You have done killed every creepy crawly critter in there. That's why out buildings were white washed not for looks.
I am sure when they get home and you say what you did they will be grateful. If not just say You ask if I would look after the chickens and I did. I WOULD NOT ASK FOR MONEY FOR DOING THIS I WOULD DO IT BECAUSE I AM NEIGHBORLY.