This is entirely true.
Get yourself a good outfit , clean van, uniform, be punctual, reliable and above all be polite and courteous at all times.
Get a trade LOGO or 2 (not saying that because of my involvement with one) every big and successful firm wear there affiliations with pride.
Then the work will come to you, chances are some of your domestic customers are factory bosses , hotel owners, supermarket managers, letting agents.
If they see you looking pro instead of mickey mouse(which they will tolerate if you have always been there window cleaner) they will notice you and you will be seen as the man who could possibly be capable of cleaning there hotel windows etc.
How do i know ? i have been there, when i had my clapped out estate car people didnt mind me cleaning there houses , but didnt get asked for the other stuff until i changed my frontage.
From there it will snowball, slowly at first but if you nurture it right it will.
I have just quoted for my second M&S , i couldnt of done that without my first one could I.
There is no easy fix and it takes time, it took me about 6 years until i hit the right veins of work. just think and act like a pro and you will be treated like one.
Be patient, it is a waiting game, just be there ready to pounce when that window cleaning firm messes up or gets to greedy, most people are happy with there wc just the same as domestic. you have to put your presence out and just wait for those slips.
there are a few other ways of getting work , but good things come to those who wait , especially those who are waiting prepared.
Dave