Had one this week
"oh i really need a window cleaner can you come round please"
"no prob"
Went round, 30 mile round trip "will it be a regular thing?"
"oh yes definatly"
"it will be £x amount"
"oh thats excellent"
"right well we're letting it as a holiday home soon so ill give you a call in april for the first clean and then let you know as and when its needed"
My face must of been a picture, :

down little lanes, wasted about an hour of my time.