From what i have read on the subject of flyers i believe that you should not put too much information on them i.e Just put what it is you do, company name and phone number. People cannot be bothered to digest too much information and bin them without reading. I have found that the following works for me fairly well
Premier Window Cleaners
Work in this area every month, for a free quotation
Tel: 01234567890
If you get a 3% take up you are doing well.
Hope this Helps
Denzle