So your sink is not draining the way you would like it to? Try this.
1/2 C White Vinegar
1/4 C Baking soda
Cover the drain and let the chemistry do its work. Follow by Boiling water.
Now, if this does not work, you may need to snake your drain, use a draino type product, or ask you husband to undo the plumbing and see what is stuck.