to go wfp with a back pack what other equipment do you need. I'm trad at the mo and wanna get to the windows with roofs below it hard with a ladder
a smallish RO / DI unit ( 75 GPD ish ) under 100 quid
a 210 L rainwater butt ( 20 quid ) or if you have the space a bigger IBC tank ( 50 quid )
a backpack, window cleaning warehouse have them for 80 quid
a pole ( take your pic, i use the Zensorflex which you can build for 25 quid )
a lightweight brush ( many use the tesco's value brush with jets fitted and a few bristles cut out ) less than 10 quid
some hose to get the water from backpack to brush head, 10 M Hozelock micro irrigation pipe, 5 quid in most DIY stores B&Q etc etc
some 25 L barrels to carry your water from home to site, you can get them from car wash places, they have the soap in them, you will get these for free as they sling them out, or buy them for 4 / 5 quid each new
thats about it for your basic starter kit, many use this setup day in day out, and are very happy with it