How I Removed Red Stains from Silicone Lids Using Baking Soda (Simple Method That Actually Works) Silicone kitchen tools are great, but they get stained very easily, especially by chilli oil, kimchi broth, curry, or anything with a strong red colour. I had the same problem with my PrepWorks Silicone Lids from Costco, and I almost threw them away. Luckily, a simple baking soda cleaning method helped remove most of the staining, so I wanted to share what worked for me. Product: PrepWorks Silicone 10 Lids (Costco) 3 small (15 cm)/ 4 medium (20 cm)/ 3 large (26.4 cm)- I bought them during a $15 sale, which was a great deal. 👉If you’re wondering whether a Costco membership is worth it, read our detailed post on Costco membership benefits and considerations . The stain happened after storing leftover mapo tofu. Some chilli oil splashed onto the lid, turning it bright red. Red-stained silicon lid from leftover mapo tofu Why Silicone Gets Stained So Easily Silicone looks smooth, but th...