hmm... It's about 15 miles from me, i'm looking for more customers but not sure if i'm up for travelling that far... 
I was called about a job once that was about 15 miles from me, I didnt really need the work but knew another new starter, so I told the woman I would get her a cleaner.
Lo and behold everyone turned it down, so as I had told her I would get her a cleaner I dully did it myself and carded the 2 new estates in that village.
That was 9 months ago, it turned out only one other window cleaner was working the area and he is very rough, I started getting call after call, booked them all in for quotes on a saturday morning and quoted high. From there it has grown and grown, I now work that area 2 days a month (5 hour days) and earn near on 50 pound an hour there with a new customer picked up evey visit.
Take it on - there is a reason they are asking cleaners from further afield.
Marc