[Mike Halliday]

if you want to get psychological minipulation

try this trick I once saw on Tinmen ( a film with Danny DeVito & Richard Dryfuss)

ask the customer if they are happy with your workmanship, when they yes ask them if they will recommend you to thier friends. Most people will say yes,  then tell them that you give a £5 referal fee to all customers who recommend your cleaning services.

then say " because I can see you are an honest & trustworthy person and you've said you will recommend me to your friends I'll give you the first £5 referal fee right now!" and then hand them a crisp, clean £5 note.

I'm sure you can see the psychological implications of what you've just done

Mike

[paul_smith]

Like Mike,s idea,if you were skint you could give them a monopoly ten pound note and promise to replace it when the referal comes in with a real one.
Paul