Unblocking Sink Pipes [best] -

Only do this if you have metal pipes. If you have PVC (plastic) pipes, boiling water can loosen the seals. Use hot tap water instead. 2. The Classic Baking Soda & Vinegar Volcano

You can buy a cheap plastic "drain ziptie" with barbs on it. Slide it down, wiggle it, and pull. You’ll be disgusted by what comes out, but your sink will drain perfectly. When to Call a Pro unblocking sink pipes