Do you have a website? Reason I ask - the only way to contact you from that signage is to remember the mobile number long enough to call it at some time in the future. How many people could do that?
If you have a website, at least people could search for 'window cleaner......' for whatever area you are and then hopefully your site would be somewhere near the top.
Of course, if you are parked - better still if you are parked and working then they have time to write down your number, but if you are driving there's very little chance of that.
Good clear signage is essential, and yours is certainly that, but I think you will miss a large percentage of enquiries simply because people don't get the chance to note your contact details.
We have 'Google Ian Lancaster'
Go on, try it
