I wouldn’t call this advice. Just a anecdote.
A few years ago I purchased an adult Ameraucana hen. When I picked her up it had rained all morning. The seller offered me, for free, the eggs that were laid that day to try hatching. I got about 15+ eggs. They were completely covered in poop and mud. They were so gross I wouldn’t even put them in my truck. They rode home in the bed of the truck in a rusty #10 can.
There was no way I was incubating them as is. Since I didn’t have anything to loose I washed them directly under the faucet in warm water. Then sprayed them down with chlorhexidine disinfectant. After drying they went in the incubator.
It turned out to be a pretty good hatch! Two of my favorite hens came from it.
I don’t think you have much to loose cleaning those eggs. Or clean half and use rest others as a control group. There is a lot to be learned from trying out different techniques.