Glass and frames is fair enough. You're good honest window cleaners! No sarcasm intended, but think about this...
Trevor Knight recently posted his method on how he gains BIG commercial work.
It followed a post I made about what happened when a friend and I quoted for a large golf club and hotel complex.
We quoted £1,800 per month to clean this place. The current window cleaners charged £1000 and then dropped their price to £800 (I had inside info) and asked how this could be possible.
Trevor said the company would do the same as his company. Basically, they'd clean everything 'in and out' on the first two times and then start working on a 'rotational basis', ensuring that one of the priorities were the management's windows. They check areas and if they're not too bad, they get left.
He did say this wasn't professional, nor was it honest, but it's how it's done.
I do take short cuts; anything possible; it's in my nature, but I have a good customer base who seem to like me. I get plenty of referals and I'm happy with the way my business is developing.
It may sound like I do a 'shoddy job'; I don't, I just do the minimum I think will keep the customer happy.
On the rare occasion I/we get it wrong and lose an account, I think that's worth it.