Yeah probably £40-£60 an hour, let's look at burnley where the houses are between £20,000 - £70,000 . The price to clean those windows is going to be around £5 a month. Here in leyland , I would say the house prices aren't that expensive around £100,000. Majority is ex council houses, im gonna have to up my prices but no where near southern prices, it would be interesting for other northerners to speak up 
Smurf obviously doesnt understand the north south divide!
I am from bolton and was a window cleaner up there for 15 years. That house would fetch around 8-12 pounds a clean, maybe 15 at a push in south manchester but where i live in poole now it would be between 22-30 pounds.
People know the price in the area and thats what dictates, maybe you can push the boundaries a bit but i never had any joy at trying to charge southern prices whilst Up north.
That's very true, people round here do seem to know what the price is in the area, if only there was a way to get ALL the northern window cleaners to have a base price...of at least £10 a house 
South Manchester,where I used to live, I reckon you'd get more than £15 for that job. More like over 20 , monthly.
I've lived all over Cheshire and the prices vary from town to town.
In Runcorn, where I live ,you're probably talking about £17 monthly, but in Chester or Northwich you'd get more.
Prices vary more than you'd think.