Slow bathroom sink faucet

I have a bathroom that gets used maybe once a day. The faucet in the sink is running really slow. I would describe it as a heavy constant drip. When I shut off the faucet, it continues for maybe 4 or 5 seconds and then stops. I have taken apart all of the tubes and pipes to the wall and cleaned everything, not the cleanest water going through, and that helps for a few weeks but then it goes back to really low pressure. When I do clean it out, I get ok pressure but its not a good steady stream, it more like a spray in all directions. I am thinking there is build up in the faucet at the spout. Anyone else have any ideas and what is the easiest way to resolve this?
Thanks, Steve
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"Steve"
We'll assume you've tried cleaning the aerator. If it's both hot and cold that's running slow, then you might have to change the faucet. There's a chance, though, that it could be the actual pipes running to the faucet.
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