Is your window cleaner actually licensed?
In Scotland they have to be. Under the Civic Government (Scotland) Act 1982 every window cleaner needs a licence from their local council, employed or self-employed, no exceptions. Getting one means a police check, because the job puts you round the back of people's houses looking in. I'm licensed with Aberdeenshire Council and I carry it. Ask to see it. Ask whoever else quotes you to see theirs, as well.
Why are my windows still wet when you leave?
Because they're meant to be. The water in the tank has had everything taken out of it, so when it dries there's nothing left behind to make a spot or a streak. Ordinary tap water would leave marks, and that's what dries on and makes them look worse than when you started. Leave them be and they'll dry clear on their own. Whatever you do, don't wipe them with a cloth.
Do you clean the frames and sills, or just the glass?
Frames, sills and doors, every time, as part of the price. It's not an add-on. There's not much point having clean glass sat in a green frame.
Do I need to be at home?
No. It's all done from outside, so as long as there's access round the house you can be at work, out, or anywhere else. Gates unlocked and dogs in is all I ask.
How often should windows be done?
Most houses round here settle into every four to eight weeks. Spring is the worst of it with the pine pollen, and autumn brings the leaf muck. Those are the two times people notice the difference most.
Is it worth cleaning solar panels?
Yes, and more than people expect. Panels work on light hitting the cells, so anything sitting on the glass is shading them: dust, pollen, bird muck, moss creeping in from the frame edge. The panels are also at an angle and never get walked past, so nobody notices how bad they've got.
What if I'm not happy with it?
Say so and it gets put right, no argument and no charge for going back. That's what the satisfaction guarantee is for.