Dark areas on vinyl

What’s up boys I have a question about dark areas on white vinyl siding where the siding doesn’t get much sunlight. I’m finding this mostly on the fist few slats under the roof line. I tried scrubbing and upping the strength of my mix still nothing, any help would be great or giving me a better idea on what to search bc I can’t find on past topics. Thanks guys sorry if this is rookie repeat

I use EBC on that.

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Thanks Steve I’ll give ebc a shot