We make the preparation a foreplay experience. I'll either help him with the douche if I am up for it, but usually as his top, I "send" him to get ready for his night. We have this Unisex Douche
but it works better for me for my hygiene needs vaginally than it does for him. We are probably going to invest in the Colt
system soon, as he wants something that we can squeeze to fill him rather than waiting for it to slowly fill him as the one we currently have does since it's gravity-based.
You can also try using gloves. Even if he's clean, I'll still wear doctor's gloves (not latex, whatever it is they use now, but latex works too) to protect my hands. I do this for a number of reasons, not just cleanliness. My biggest reason is it makes prepping him easier and I get less lube on my skin so I when I move up from fingers to toys, I don't have to worry about not having a good grip on the bases of our toys so that I can maneuver them more easily. But this is also a good option if you're being "too spontaneous" for a good cleaning. That way if things are messier than you prefer, it's not on your skin.