✅ Microfiber Cloth I Use (Amazon – paid link): br Disclosure: Some links above are affiliate links which means I may earn a small commission if you click and buy, at no extra cost to you.br br Ninja Support: br Ninja Double Oven (DCT451) beeping or flashing lights? This guide explains what the alerts mean from end-of-cycle beeps to preheat signals, standby mode, Smart Finish holds, and error codes.