My "ideal" Seller will simply label the cutting individually with a marker or tag. drop it in a ziplock bag and ship it to me using an option that it will arrive in 2-3 days.
I've bought many hundreds of cuttings over the past few years, The ones I have the least rooting percentage are the ones where the seller has "cleaned" them before shipping. I cringe when I hear of people using high percentage bleach baths. My reasoning for not wonting the seller to clean them is because if Im going to store them long term I will clean them before striking them, so then they get cleaned twice. Also the added cleaning step is another place for cutting variety mix ups.
When we buy cuttings, we are buying a chance to have a new variety, I just want the best advantage of bringing that cutting to a beautiful full-grown tree.
If I'm rooting my cuttings fresh from the tree I do nothing to them, If they've been in the fridge a spell, they get a light scrub using a soft toothbrush and a 2 gallon basin of warm soapy Dawn dish soap and about 1/4 ounce of kitchen bleach.