Could not find info on a N00WW following parts are for a J00WW
Replacement parts for General Electric GSD4000J00WW Dishwasher | AppliancePartsPros.com

I would not put draino into a dishwasher. It could eat some of the plastics used in the unit.

I am assuming that it used to drain OK and nothing has been changed with the hook up.

Remove the kick plate from the front of the unit.
Does the wash/drain solenoid (left side on the pump) pull down when the unit is trying to drain?

If yes:
Remove the drain hose from the house plumbing and check for a plug here.
You could try draining it into a pail. Just be sure to hold the hose firmly in the pail and put a towel over it so that it does not splash all over.

Remove the sump cover (bottom center of the tub) and check that is free from debris and has nothing wrapped around the chopper. Be careful as there is often glass in the tub

Remove the screened cover (back bottom of the tub) and unscrew the Piston & Nut (Item 564 in Section 2) and check that it is sealing correctly.
This is a very common cause of the unit not draining completely as it allows the water to get back into the tub instead of being pumped out the drain hose.