You say that taking on someone to help you is not for you, I think you should look at this again and give it a proper try.
By the sound of it if you are 4 weeks behind, then in reality you have 8 weeks of window cleaning work GUARANTEED!! You've obviously worked hard to build it up and sound as if you have a good reputation in your area, SO WHY LET IT ALL GO?
Take someone on, get them to work with you doing the bottoms whilst you do the tops. Within a week, if you have spent a bit of time with them, training them in correct techniques and standards, they will be doing a good job and keeping up with you. I can guarantee you that 2 good people working together are more than twice as fast as one person working by themselves.
You can either take them on the books or get them to go self employed. If you pay them a fair wage based on daily earnings then they will stay with you.
Within no time your worries and stress will be a thing of the past. I can now go on a two week holiday and am assured that the work is still getting done and money is still going into the bank whilst I'm away.
If you want to discuss it more, drop me an email at
ian@lionheartcleaning.co.uk