Propper top tip for tradders.
Get a cheap second hand wfp, connect to a household hose (where they have them) and clean all the frames and window with tap water (don't forget to charge a bit more). Squeegee off the windows as normal. Hey presto you should have a happy customer, more money in your pocket and an easy job to come back to.
This also works with doors, garage doors, soffits and gutters, gates and garden furiture etc. Those hard to get to windows above conservatories that never get touched would look much better even using tap water.
For an investment of a couple of hundred quid you can make a mojor impact on your earning potential with your existing customers.
ciao