Good thread guy with some excellent replies, I'm just going to concour with mr gold and 8 weekly
Ian - well done on going back, we would have done the same, it's important that the 'staff' are aware of the standards required that being one of the reasons we use a bonus system for complaints.
Before beating DtM about the head too much, bear in mind this customer was really gunning to find an error jugdeing by your post - unfortunately see was given one on a plate, still it was handled very well and be extra vigulant on the next 3 cleans. But gut feeling is there will be trouble ahead ( next complaint will be the sills are left too wet )
Darran