This may be a bit confusing but here's what I do.
I have a Stihl leaf blower/shredder, like this:
https://lockcityhomecentersaultstem...and-shredder-vacs/shredder-vacs/sh56ce/?I bought the Stihl gutter cleaning kit:
https://lockcityhomecentersaultstem...edder-vacs/blower-accessories/gutterkit/The gutter cleaning kit is meant to be attached to the leaf blower/shredder when it's set up as a blower so you can blow the leaves, etc. out of the gutters. I did that once but the problem with blowing out the gutters is that some of the leaves, etc. wind up blown out onto the roof and wind up back in the gutters later on.
So, instead of blowing out the gutters, I vacuum the gutters out by attaching the gutter cleaning kit to the intake tube on the blower/shredder.
This is where the confusing part can be. The intake tube of the blower/shredder is larger than the first tube of the gutter cleaning kit. So, I place the first tube of the gutter cleaning kit inside the intake tube of the blower/shredder and to seal up the gap, I wrap both with duct tape. I know a picture would really help with explaining this but I don't have one. Think of placing a drinking straw inside a 3/4-inch tube. To seal up the gap, I use duct tape.
Once the gap is sealed up, I attach the other extensions of the gutter cleaning kit to give me the length I need so I can be on the ground and reach up to vacuum my gutters.
My house is a high-rise bungalow. My gutters are higher up than a single-story house but your girlfriend's house is taller than my house so you'll probably need to be standing on something to reach. I'm thinking a scaffolding setup like this should work:
https://www.harborfreight.com/paint...pacity-multi-purpose-scaffold-63050.htmlStand on the scaffolding, then with the blower/shredder and the gutter cleaning kit all assembled, you should be able to vacuum out the gutters.
Hopefully this helps.
Mike.