"English weather is unpredictable, but our customers don't like unpredictable service. To make sure we always call to you as regularly as possible we have invested in the latest PURE WATER cleaning technology which allows us to work in the rain without affecting the dazzling results our customers have come to expect. The same "100% Satisfaction Guarantee" applies in the rain as in the dry. If you're not happy just call us within 24 hours, and we'll re-clean free of charge."
Love it!
Here's mine - but after reading the above I might change it.
Dear Customer - a note from your window cleaner ...
As you are aware we try to provide a regular service and keep to a reasonably predictable schedule; however with more customers than ever before and especially during the winter months with inclement weather and "shorter" days, it can be a bit of a juggling act getting the balance between arriving on time and not cleaning in really bad weather.
To preserve schedules we clean not only in fine weather but in drizzly or showery conditions too. Please be assured that the purified water system which (unlike the previous method used) contains no soapy residues ensures that your windows remain clean despite any rain from squally showers that may land on the glass in the ensuing day or two.
However in the rare event that you feel convinced that the rain immediately following within 24 hours of our visit contained pollution residue that has obviously marked your glass then please do not hesitate to call us back and we will gladly clean the offending window(s) again.