What are these insects in my bathroom sink?

There are like these really small insects which are maybe 4mm in diameter, they have grey wings… they can barely fly (looks more like they hop from one place to another).. The only place in my house that they exist is in the sink of one of the washrooms. I kill them every day by just simply throwing water at them.. have tried spilling stuff down the sink to kill them.. it just seems like there’s an endless supply of them.

What are they?
thanks Elyn! that’s exactly what they are

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