Be sure to use the correct clean-out. You don't want to use the one toward your house.
Why not? They both go to the same place. In my thirty-some years of plumbing, I have installed thousands of sewers and I can tell you, without a doubt, it makes no difference which clean out you dump into.
Bruce
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2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
If you're really that concerned about capacity and chemicals then buy extra hose and use the neighbors clean out. They can't be home all of the time!!😀😀