Compressed air is step 1, most often this clears the passage. I also use a solid copper ground wire and slide it through the entire run of the drain.
This "tool" is inexpensive.
Go to a hardware store and purchase a five foot length.
Use a scrap of sand paper to deburr or round off the edges.
gently slide in and out working the wire through the entire length of drain.
since it is coppe it will flex through the bends and break up any clogs.
If I hit a more stubborn clog I rotate the wire gently to break it up.
Do not force it work slowly and the clog will release.
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