Hello Doreen, Even though we have an auger, most commonly we find that our bathroom sink drains need to be physically fished out. Either using an unbent hanger as a refashioned hook or plastic barbed tool from the dollar store to explore the drain obstruction.
Fishing out the blockage with that in -our experience— to partially involve hair seems to most readily alleviate stoppage in our faucets and shower drains.
Once your sink is unclogged, pour 1 cup baking soda and 1 cup white distilled vinegar down the drains, weekly. After 45 minutes pour a pan of boiling water down the drain to keep it open. Liquid hand soaps, hair, soft milled soaps, and kitchen grease contribute to drain blockages.