Standard message to all custies -
Hi, Cap'n Sparkle window cleaning will be calling tomorrow to clean your windows, many thanks, Glenn.
Any I don't get to because of rain etc. (could be all or just a few) -
Sorry, It's weather for ducks not window cleaners will try again tomorrow, kind regards, Glenn.
As mentioned above, it helps if you know your custies but even a new customer will get the gist of both messages.
Glenn