I've never heard of such a thing! If you're thinking it might help debris from hanging up in the downspout I would be afraid of it having the opposite affect. Any oily substance will eventually turn to grime since dust and the like will stick to it, causing a buildup. Therefor things can hang up easier. Is it leaves hanging up or what?
As you slide down the banister of life, may the splinters never point the wrong way...
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