Is it possible that the paint has yellowed? If so, nothing will change that.

If they were my cabinets, I would first try a multi-purpose cleaner - like Mr. Clean liquid or Spic & Span mixed with hot water, then rinse. Or a vinegar and water solution.

If they had a lot of grease on them, maybe I would try some Dawn dishwashing liquid mixed with hot water. If they were really a mess, I might wipe them down with a solvent like mineral spirits. Mineral spirits is a paint thinner, so you have to be careful and test in an inconspicuous spot.

Whatever you use, be careful with the scrubbing - you can scrub the paint off.

I don't think the paint has yellowed, nor is there much grease. I read somewhere that Spic and Span is in the family of TSP, so I think you are right on the money there!!! Off to the store to find Spic and Span.
Thank you so much!!