Bad smell in dishwasher, have cleaned and even used bleach. The smell just comes back. even smells on the dishes. the smell is like a stink bug.

Three things, dryer coil, food stuck inside.

Most washers have a one way valve on the drain and a water trap
created with the line, so no water or smell can go into the machine.

Check the valve, remove the hose,that should be under the sink,
wrap a cloth around it and blow,it should not be able to blow into it.
Then make sure the hose at some point go higher then where it
connects to the drain.

Fill a bucket and fill the washer until you see a little in the bottom of the machine, watch it for a few minutes to see if it drains, it
shouldn't, dump in a bottle of white vinegar and run the machine, make sure dry is off. Then run it again, do not add anything.

Usually a bad smell comes from the garbage disposal, food keeps going through it, and bacteria builds up, the dishwasher runs into the disposal then out run bleach through the disposal, itseems to be coming back to the dishwasher make sure you always put bleach in the disposal befor running dishwasher keep it clean