The honest answer is the ressession is affecting everyone, and yes, more people wanted 8 weekly cleans, some dropping you etc is all things you should expect, but the main thing I think is to stay possitive.
Just because there is a ressession it doesnt mean that people are stopping spending completely and it doesnt mean that you wont get more works and customers if you look for it, its just means that they will be alittle harder to find.
With the likes of Woolworth's demise I bet Argos are better than expected and certainly will rake it in come chistmas, and there success will be because they ran a more productive and profitable business that was able to ride the storm longer than Woolworths.
Window cleaners are exactly the same, even though there are many newbies popping up at the momment, there ones that are saying business is terrible at the momment are the ones that may go and the ones that get out and just work that little bit harder to find the customers are the ones that will ride this storm.
So my input is dont dwell on the effects of the ressession, just get out and get on with it, do everything you can and give everything you have got and you will find success in a time when it is a rare thing.