Yes quantity will get you work, but as we all know the percentage of people that have their carpets cleaned in the UK is still very low.
If you put the right info in your leaflets you can actually pursuade / convert ( SCARE!!

) the ones that have previously never had their carpets cleaned and if you don't do this, it'll never change, educate your custy's.
The next thing is to entise them to read the brochure, if it looks the part your increasing those chances, think about getting a professional graphic designer involved, read some articles on the net, think who your flyer is aimed at (the woman of the house usually) colour scheme, no spelling mistakes and good grammer.
Think - PROFESSIONAL PROFESSIONAL PROFESSIONAL
If a custy gets 2 CC flyers, make sure it's you they call.
Paul