Read all of the previous with interest. Must say that looking more professional just doing window cleaning is a load of tosh though. I am not 'a jack of all trades, master of none.' Like many others on here, I do lots of trades and am master at all. Why add it to my business unless I do it well?
My OCD tendencies suit cleaning. To do a naff job at one of my bolt on services would deeply offend my sensibilities. I like to leave every job thinking it is a thing of sartorial elegance, be it windows, fascias, solar, driveways, whatever. I take it personally when a customer is not happy with the standard.
My staff are uniformed, my new van sign written very well, I use professional standard equipment and chemicals without expense spared, my websites are professional, my business stationary well thought out and presented.
When I concentrated solely on window cleaning, I used DIY ladders, walked on roofs with dodgy angles, scrimped on my kit, didn't have a uniform, nothing. Offering more services has made me more professional and my business more profitable.
I frequently get an email asking for driveway, patio, decking, fascia, conservatory roof and regular window cleaning all from the same customer. I ask everyone why they picked me off the Internet and without fail they say they want to deal with one company who can do it all in one go.
I market my business, no longer as a window cleaning business, but a property cleaning business.
Guys who concentrate on windows can be very professional. Just because some of us offer more than windows does not make us less professional. Some may think it makes us more entrepreneurial...