If You have your hose outside the pole, tie a ring near the bottom with a bit of thin bungy, when you want to stop the flow/pump just fold your hose and slip the ring over it.
If you must carry your pole extended, then keep the brush in front of you where you can see it. Don't sling it over your shoulder or you will tangle up in every washing line/hanging basket, and those dreaded garden arches and bushes.
Use shower cutain rings to clip your hose to the pole, the C shape ones, not the ones with clips on. These won't slide down passed your locking cones but will let your tail hose run through.
Avoid getting water up into the window vents, they drip dirty water onto your clean glass.
Don't do doors with letter boxes with WFP the dirt from behind the letter box will run down long after you have gone. When doing this type of door trad, use as little water on your applicator as possible and hold your sill rag over the box so that water can't get behind. It is quite embarrasing when you go round collecting and see two dirty lines down the bottom panel that have come from behind the letter box, better still have a scrim in your pocket when you go collecting.
Don't charge your battery untill it is half disscharged or it's life will be deminished.
Buy a cheap multimeter, when the reading drops to 12.06 volts it's the time for recharging.
I think that's enough to be going on with, will post again when I can think of more. Dai