Sediment broken free in pipes has likely caused lower water pressure

I cut a 2" black pipe (with a carbide Diablo sawzall blade, highly recommended!) coming from my washer/deep sink in the garage and the thing was 80% choked with solid sludge. Looked like I sliced a pecan log. That fed a leaking cast iron double Y that I posted a few months ago. I replaced the entire intersection with PVC and will do the washer run some other day but thats a straight 30' shot of 2" PVC. Good luck finding the blockage. Maybe a snake from the rental place?