I look everything over before sending it out. If you look the card over and think it looks clean, there's no need to wipe it. I'll swap out penny sleeves if the one it was sent in was dirty.
For what it's worth, it seems like PSA is getting stricter lately with the overwhelming amount of cards being sent in.
I always swap out sleeves if a raw card comes in a top loader....but i see some of these dudes doing these elaborate cleaning methods on these cards,you cannot tell me its not risky rubbing a card for 5 mins up and down with a cloth,ur potentially gonna damage a corner....Anything i get from a pack or box goes directly into a sleeve and card grader,im not taking it out again to have a dusting session.....i have graded PSA 9s but also quite a few gem mints without doing all of that...