I love the sf2 it's the best thing service ever. I cannot tell you how many times I have been to non asian in calls and I could smell the cologne of the previous client. Worse is during daty, the smell of condom, not so much now that most sps don't use latex. Or the smell of dried saliva on her breast, all boner killers. That's when I usually just settle for a BJ and get the hell out, never repeating.
I went to an incall, hot well reviewed girl.. but the odour below was too much. After my first sf2 at an Asian incall, I have been encouraging non Asian spa to join me in the shower.. but I get all the excuses, it dries my skin, my hair, my makeup etc.. well then if you expect me to be all cleaned up, then please have the courtesy to do the same.
To clarify, the sf2 is also after the deed. So the SPs do have a shower before the next client but still goes in with the next client. So yes it does take up some of the clients time, but for me I prefer the SPs have proper hygiene over just towelettes wipes.