Hmm, I had hoped for a few more responses. So its not something many people have tried, then?
I am in a very old house, Charles, I'm renting and I think its around 50 years old but I'm not keen to get up in the roof cavity.
The gutters are another option, I might have to borrow a ladder, I'm pretty sure there is some sludge up there I can scoop out as I pulled out some weeds I could see growing up there a few months ago so there are collection points.
I might try a few different things and compare results.
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