To get rid of roaches in your kitchen sink, you can try the following:
Clean your kitchen sink thoroughly, using a solution of warm water and soap. Make sure to get into all the crevices and drain openings.
Pour boiling water down the drain to kill any roaches or eggs that may be hiding there.
Apply a mixture of baking soda and vinegar to the drain, which can help break down any food or organic matter that might be attracting roaches.
Place a roach trap or bait near the sink to entice and kill the remaining roaches.
Regularly clean your kitchen and remove any sources of food or moisture that may be attracting roaches, such as dirty dishes, standing water, or open food containers.