I no expert and would not say the brightest person around.
But all that have paid for this, put the invoice through your books an this way at least you will pay less tax.
The company that owns the website that all these people are paying money in to, Fair play to you your business idea is working for you, without promising anybody any work.
This is why i say i am not the brightest person (I wish i would have created a similar website, more profit than trying to produce water fed poles etc)..
Then only thing i would have done before accepting money from window cleaners, was to make sure in any search engine, that if somebody was looking for a window cleaner in a certain area. The web site i created will at least show on the first page of the search result, put do better than that get up the top of the search page, Once this was done, then i would accept payments from window cleaners.
I did type in Google "looking for a window cleaner in a certain area and postcode"
Did not view anymore than the first page of results even the side adds, could not find this company anywhere,
I did get yel.com come within the first 5, which cost me nothing to join.
But i am not stating this is a bad idea, nothing ventured-nothing gained.
But very good idea for a quick business and could work........I may not be to late after all, i have website templates