I would recommend keeping trap on and let water stand in sink, auger thru opening in sink that way when you hit blockage you know the drain is open. If you take the trap off you don't know if you hit the blockage. For know it sounds like you are using a hand snake, if that is the case bend the tip of the snake to about a 45 degree angle, this will help you make the bend's and clear the pipe's as well. If you have older plumbing,problem's with improper drainage fitting's could play a role in having trouble unclogging sink.





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