or whether they need a good shower
This comes up again again amongst Thais when talking about Farang. One guy I first met in Pattaya when "Thai Boys" had just opened (it's gone now) reckoned he could tell one nationality from another just by smell. There was even one nationality that he avoided if at all possible as he said they smelt the worst of the lot. I met up with him recently and we had to leave a shop in The Royal Garden Mall because he'd smelt a group of his least favourite nationality as soon as he entered.
My Thai boyfriend has just moved into a new rented room. He's had to clean the whole place twice because, as he says "Farang, stinky" had been there before him.