I've just read this topis and my method of getting commercial work is so simple.
I simply walk into any where commercial whether it be shops, offices or factories and just ask if they need a window cleaner and leave a leaflet.
We may have missed out on a lot of work by not having printed literature to leave and all that stuff but every time I spend a day canvasing I always pick up at least one job and often, we get a phone call weeks or sometimes months later.
Then it's a case of doing the quote and we price our selves a bit on the high side. To date our success rate is roughly 70% of those jobs we quote for.
The way I canvass for work is quick, simple and effective.
I know others have more elaborate methods and that may work for them but for me - I walk in and ask.
Cheers