I'm a fan of Main Line Drain Cleaner which uses lye. I think lye is generally your best bet although most of your Liquid Plumbers use lye.
https://www.homedepot.com/p/Instant-Power-128-oz-Main-Line-Cleaner-1801/100126446
I unfortunately spent a pretty large amount of money on clearing my drains and digging up my yard and installing some new drains before I learned about the Main Line drain cleaner which uses lye.
Monday 7-1
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