xattt says>"(2) Proteins, like supplements, eggs, less cooked meats or cat food, tend to denature more and get stuck/baked to dishes to the point of needing a rewash."<

Proteins are softened and loosened by soaking in water. Many glues are protein-based and, for that reason, protein-glued items should not be exposed to high humidity or water. For example, most violins are glued with animal hide/hoof or fish protein glues.

Soaking protein in plain water will eventually loosen it completely. The process is reversible: drying re-hardens the protein.