I think you being clean is obviously important to the prossie, but I do personally think some of them do overstate it's significance somewhat. Obviously they don't what you to stink of shit, or look like a tramp who hasn't washed or groomed at all in weeks. But I think at the end of the day, as long as she comes out of the meeting with you with her health and sanity intact, with money in her hand, I personally don't really think most prossies really give a shit much beyond that.
Trim your nails, brush your teeth, shower, wear clean clothes, not have the Amazon growing down there, you know, basic hygiene that most guys should do anyway, is all you really need to worry about IMO. Common sense really. But honestly, the way some prossies moan on forums, you'd think they were literal fucking tramps, I don't doubt some do have bad hygiene, which I don't condone, but I don't think that is actually the reality of most punters. I think it's just their favourite topic of moaning, their way of being like, "look how hard it is for us being a prossie."
It's a perfect excuse as well, "I didn't give him good service because her smelled bad."
Funny then, that you very rarely see the kind of prossies that frequently get good reviews using that kind of excuse.