Steve, Dereks hit it on the head really people are not interested in carpet cleaning, so the hard thing is to get them to read it.
a newsletter is really just a sneaky way to keep your name in the customers head.
perhaps you can do the 65% with a subliminal advert for yourself
I would include in a newsletter;
a.... did you know?.....
joke of the month
this week 20yrs ago
introduction to a local tradesmen ( who will pay your postage for the privilege of being on your
newsletter)
Born today in 1901..1902...1903 etc
make it interesting