The black rubbery gunk in your sink drain is likely a mixture of hair, soap scum, and other debris that accumulates over time. This mixture can form a sticky substance that clings to the walls of your drain pipes, causing slow drainage or even complete blockages.
If left untreated, this gunk can attract bacteria and other microorganisms, leading to unpleasant odors and potential health hazards. To prevent this buildup, it is important to regularly clean your sink drain using a drain cleaner or a mixture of baking soda and vinegar.
Using a drain strainer to catch hair and other debris before it enters your drain can also help prevent the buildup of this black rubbery gunk. Regular maintenance of your sink drain will not only prevent blockages and unpleasant odors but also extend the lifespan of your plumbing system.