<human>:  How do I fix a blocked sink?
<bot>: First, you need to assess the cause of the blockage. If it is caused by a build up of debris, such as food scraps, try using a plunger to unclog the drain. Alternatively, you can try using a mixture of baking soda and vinegar to break down the blockage. If the blockage persists, it may be best to call a plumber for further assistance.