Actually, the chance for bathroom sink overflow drain clogged to occur is only a little. It’s uncommon, indeed, yet it doesn’t make it impossible to happen. When it’s clogged the bathroom sink overflow leaking is what will follow. Luckily, you can fix this issue yourself.
To fix your problem with bathroom sink overflow drain clogged, a wire auger or plumber’s snake is usually used by feeding it through the funnel, entering the drain hole. Feed it as far as possible into your bathroom sink overflow drain; it will slow or stop once you’ve reached whatever blocking it.
Spin the auger handle to clear your drain and attempt to force through the blockage. Once you’re past it, alternative pulling and pushing through the drain to break up any larger chunks as well as other matter blocking your drain.
The last step in fixing the bathroom sink overflow drain clogged is pulling out the wire auger, and then blocks your main sink drain. Later, fill your bathroom sink with hot water to the level of overflow. Run the water down the drain to clear the remaining of blockage. Alternatively, use the funnel and in the hole, pour hot water. If the water freely flows through the sink drain, it means the blockage has been cleared.