For background, I'm a madman who always contacts customers the night before a clean.
Well, I was thinking about the subject of good rounds tonight when I called because every single one of them said "good, see you tomorrow" or variations on same. This bit of the round is about 18 months old, so has settled down nicely.
I think the danger point is the third clean. At that point, I think it suddenly dawns on potential messers that they are in this for the long-term and they cancel. Only a feeling - I'll check it one day.
Vin