Johnny,
I think you might be quite surprised how much can be earnt from "exterior" cleaning. I have carpet cleaning kit but I don't advertise it because I feel I only earn wages from it. Add to pressure washing - gutter clearance, facia and soffit cleaning and maybe the odd drain blockage then you have a nice living. £3k for pressure washing kit and £1k for a gutter vacuum and you have enough gear to earn a living. Get a signed van, a decent website, some nice leaflets and a reasonable attitude to work - this time next year Rodney you'll be a millionaire.
Oh you can work in the rain - no excuses