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Why Oven Trays Change Colour After Deep Cleaning Deep cleaning is very different from regular domestic cleaning. It involves removing long-term grease, carbon buildup, and deeply embedded residue  that accumulates over time. One of the most common questions we receive is about oven trays changing colour after professional cleaning . 🔍 Why does this happen? Over time, especially with frequent cooking at high temperatures, grease and fat can penetrate the surface of oven trays