Cleaning a Mcdonalds is probably more for kudos than actual earnings, which again i dont understand?!
"Oh but its such and such a company, it'll look good on our website" Great but I work for money cleaning windows, whos windows they are isnt necessarily of any interest to me.
Invoiceable work is not cash, takes a bit of admin, and you have to wait for a cheque, to bank the cheque and wait for it to be cleared....................................zzzzzzzzzzzzzz
If you had a company turning over a 1 million pounds per year, and you made the same margin from each, would you rather have a commerical or a domestic customer base?! Simples.............surely