A little bit of biology apparently the trails are microscopicly  directional  like a zip tie pointing in a direction the snail travels  this stoops the creature from sliding backwards if you figure this out then brush downwards is point less so brush from the bottom up
What I never get is how come we never see them on the glass   Bit like dead pidgins
so we can never get revenge in the little slimy swine 

Once did a gutter clear on a bungalow in the middle of a dry summer. Used the vac and it was a nightmare, dust everywhere. Ended up just using the ladder and it was quicker and far easier. Today I cleared one with grass growing out of the full length of back gutter. The customers were saying that it will be hard with all the grass in it. I told them it will be fairly easy because its been so hot it will have shrunk. The moment I got hold of a big clump the whole lot nearly came out. They were pretty upset that I made it look so easy because nothing was holding the roots in place and it was dry as a bone. I reckon it would have took me three times longer with the vac.

This post is like farting in a lift...it's wrong on so many levels!

I think the answer depends on your work - if its small stuff then a reel on the m/c or trolley would be convienient
My vans have bolted down m/c's and reels in the van we carry as standard 2 x 100 h/p hose
and 200 meters of 3/4 water feed hose

never had to go through a house yet - there is usually an alley at the rear for access

Gave this some thought today while out cleaning - I use my gloved hand 90% of the time. Wet window, rub glass, wash glass the way I described above.

Vin

Best to post this in the window cleaning forum - if that's what it's for...