What o earth do you want to do that for
Once you start using WFP don't waver and backtrack by using your squeegee and blading off the water. Your customers will soon get used to it, you have will have spent a great deal of money investing in your WFP, stick with it!!!
Make sure that you exude confidence about the system in front of your customers and don't give an inch if they start saying they want you to clean the downstairs the old way.
Tell then that if there is a problem with the way they dry out (but not on the first clean mind! Customers have to understand that there is a bedding in period) that you will come back and rectify. But also tell them that this only applies if they ring you within 24 hours, the last thing you want is some muppett ringing you after a couple of weeks of weathering to complain that they are not happy with the work!!
Although not a domestic account, I had one shop manager (this shop has a couple, one works one day, the other works another) and this particular woman was covering for the one that was usually in when I cleaned them.
I cleaned as usual and collected my wonga, I was on a shop a little further along the high street when an assistant asked if I could go back, the manageress wanted a word.
I walked in, with a fair idea of what was to come, and in a loud voice in a shop full of customers she proceeded to tell me that my work was crap!
The windows were still wet and that I had a cheek thinking I could claim to have cleaned the windows properly.
Now I am never rude to any customer, so I wasn't argumentative, but I told her (in a loud voice too
) quite bluntly that, no, it wasn't a crap job, in fact it is a pretty d a m n good job, and that if she has the patience to wait for the glass to dry out fully she will see that not only is the glass spotlessly clean, but so are the frames and so is the tiled floor outside of the windows, that I had been using this system on the windows for the past 8 months every week without a problem.
Now as I say, I wasn't in any way rude, but I was forthright, I made sure I had my 'Exuding Confidence Head' on, I didn't hedge' or mmm and ahh, she backed down sharpish and I haven't had a problem with her since. Though I did see her going over the outside really closely about 30 minutes later when I was cleaning the inside of a shop the other side of the road
To be fair to her, it was the first time she had seen it in action, so shewas entitled to be indignant, lets face it, unless you understand how it works, so would you be if some guy turned up, WFP'd your windows and with the water dripping off the sills asked you for the money
Ian