I have had some scary situations, however had the same incall.
I do often stipulate clean towel, soap, heating on because of some of the things many do not consider. Also advise no alcohol or drugs. This tends to be successful but have walked into squalor, I am fine with basic but at least have a tidy up.
On the whole majority are absolutely fine, great even and none of the indiscretion I've experienced incall.