There is often a stub pipe at the sink bottom. I wouldn't try to go in there.
Filling the sink then plunging while opening the drain stopper might even work.
You just need enough water in the sink and pea-trap to make use of the side vent/drain.
If you pour draino in it beware gurgling.
If the sink was filled to test that side drain and you suspect the side drain is holding water then avoid draino for sure.
Personally I'd just regulate the compressor to 40lbs and drag out some hose.
It'd take longer to reel the hose back than to blow the drain.
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