Ok, so I have been having issues with my bathroom sink not draining properly for almost a year. I have had plummers in and it will work fine for about 3 to 5 days. It is completly plugged right now. I have tried an industrial strenght drain cleaner(helped a little but not much), a plunger(clogged it up worse than it was)and I took apart the U-bend plastic pipe(had nothing in it). Any suggestions would be greatly appreciated.