Dear Sir,
Thank you for your letter in which you erroneously state that the "pure water" process affects the putty in your windows.
When I cleaned your kind of window the traditional way the rubbing of the glass at the edge with the soapy applicator or where the squeegee blade touched it had a far more abrasive effect than a soft bristle brush with lightly sprayed water. Indeed where the decorator did an ill prepared job or the householder expected the job to last decades instead of years I used to get paint flakes and then if still improperly maintained, putty on my cloths and in my bucket.
You cannot have clean windows without a "rubbing action"; it is not possible.
I guess that you are informed by a decorator or painter that wishes to cover his rear by not taking responsibility for a well prepared and finished job by blaming "the window cleaner".
Another favourite canard is for the double glazing installer to blame the window cleaner when he has not bought well made and assembled units and he then wishes to blame "the window cleaner" when they breakdown to poor glues, shoddy construction and temperature extremes.
If I am wrong and you do your own painting then I hope my frankness does not detract from my honesty. However if you decide to discontinue my service then please be assured that I will rest easy knowing you have been informed as to the truth of the matter.
Yours robustly (
)
Shine and Rise window cleaning to the gentry.
And breathe...
You might be able to put it more nicely if you wish to retain the customer ... you might also refer to health and safety issues of traditional cleaning that may arise!