Clean out of two sink drain

I have a dual sink bathroom vanity and both sinks are running slowly. I have tried removing the drain plugs and cleaning out the hair and stuff around the stopper, and I have removed the P traps and verified there's nothing in them, and I have also used a snake. When I do the snake it simply runs from one P trap to the other and doesn't cleAn anything significant out of the pipes. There must be a T joint in the wall that both drains connect to, but I can't get the snake to find that T joint and make the turn. Any suggestions on how to clean out the line from the T joint to the main drain/sewer line?

Disconnect the plumbing from under the sink and start your "snaking" there.

That's what I was trying to describe when I wrote about snaking from one P trap to the other. I push the snake in through one P trap and rather than making a turn at the T it just goes straight across and comes out the P trap on the other sink. I read on another post a suggestion to put a slight kink in the snake to help it make the turn at the T.

Yeah, you will need to kink the line in order to give it some direction.

Thank you. I'll give it a shot. The last thing I want to do is open up the wall and cut the pipe.

I think if I was building a house I would put clean outs and access panels everywhere I could.