I owe you all an apology for reading all the posts here for the last 6 month without saying a word. Not nice I know, but I did use the SEARCH button It helped a lot: I got for myself all the information I needed to make up my mind and get a decent RO/DI system (water from tap here is 370ppm), a Backpack with Renegade deal from Facelift, 5x25L water containers from e-bay, a good ladder and good trad stuff for inside windows. Off I went and it was better than I hoped. In just 5 weeks working 2 days a week, advertising only on FB I got all my investment back and got around 50 returning customers (4 or 6 weekly cleans) and I am ready to say goodbye to my full time job and become a full time window cleaner. Fingers crossed it all goes well! Cheers lads!