Are Soap Suds Normal After the Dishwasher is done?
If you use a rinse or &quot;anti-spotting&quot; agent (&quot;Jet Dry®&quot; is one brand name of such products) this is almost certainly the residue of that. Put a drop of in in a bottle of water and shake to observe the effect.
Personal opinion - I don't fill that spot in my dishwasher and see no ill effects from not using it.
Actual dishwasher detergent makes almost no bubbles - as anyone who has screwed up and put hand dishwashing liquid into the dishwasher will understand better than any who have not (don't do it for the experience, though - just imagine opening the dishwasher door to a wall of foam...)