No, im not especially new to the job, just never got around to joining a forum!. I work in the north east of scotland where the cold fingers of winter are starting to make themselves felt, brrr!. I have been cleaning windows for just under 2 and a half years now using a home made wfp system (dont see the point of spending a fortune to get a setup that does exactly the same as something you can put together yourself for a few hundred quid). Started off using a 1000ltr system(!), due to some duff advice about what i needed, now using a 500ltr system mounted in the back of a transit connect, which is much more efficient, but i do sometimes miss having the extra space of a bigger van (like when i need a pee!). Anyway, thats all for now, but i am going to be asking a question or 2 regarding hot water, so any experts, please keep an eye out!, cheers.