Get a box of (trisodium phosphate) at Home Depot or Lowe's and follow the directions to wash them with it. It cuts through it all. Wear rubber household gloves -- those (typically) yellow ones you wear to wash dishes and the like.
I've had excellent results using Krud Kutter Kitchen Degreaser (All Purpose Cleaner). You may have to allow the solution to sit for a bit to penetrate the buildup and it may need more than one application. The great part is that this product is safe to use around food surfaces. One caveat: it does not work well on burnt on grease; e.g., stove burners.
I would probably pour boiling water over them then scrub with a scrubby and any of the products others have suggested. Then when all is dry either paint with a high gloss paint or coat with polyurethane.
I tried murphy's oil, spic & span, goof off with a scrubber and lots of elbow power, yet the grease build up is still noticeable on part of the cabinet and walls. I d...
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Get a box of (trisodium phosphate) at Home Depot or Lowe's and follow the directions to wash them with it. It cuts through it all. Wear rubber household gloves -- those (typically) yellow ones you wear to wash dishes and the like.
Murphy's oil soap, in thick application. Let set few minutes, scrub off. May have to repeat.
I've used TSP substitute and it works wonders.
I've had excellent results using Krud Kutter Kitchen Degreaser (All Purpose Cleaner). You may have to allow the solution to sit for a bit to penetrate the buildup and it may need more than one application. The great part is that this product is safe to use around food surfaces. One caveat: it does not work well on burnt on grease; e.g., stove burners.
https://www.amazon.com/Krud-Kutter-305373-Degreaser-All-Purpose/dp/B01MRHQG7K/ref=sr_1_1_sspa?s=home-garden&ie=UTF8&qid=1530879443&sr=1-1-spons&keywords=krud+kutter&psc=1