If there's visible sweat - wipe it
If there isn't - why bother....
That's usually my gauge lol
I agree... However, I know that I can be a little O.C.D. at times and if I think something is gross, I'll just clean it myself. It doesn't take but a second to wipe it down. But, I'll never get upset about it and go chew someone out for leaving a little sweat on a bench.
I also like to keep an organized area. I'm the guy that will put the DB's and weights back in the right order. I do it for me and never complain. Besides, it gives me something to do between sets.
So, flame away at me for this if you must. I'll understand!