I was using a reusable menstrual disc from a competitor (LOVE flex discs more, but they didn’t have a reusable product yet) and I cleaned it with an unscented soap and boiled it between cycles as the instructions say. However, I couldn’t for the life of me get the stains/discoloration out. I even used a toothbrush to scrub and that wasn’t enough…it felt like it left a film behind on the disc. I recently got the Flex reusable disc since it just came out and I prefer The Flex brand over others. I decided to snag the foam wash and give it a try. It works wonderfully! Since the disc is clear you can easily tell if any discoloration is left behind and so far the wash cleans the disc very thoroughly. It’s not an airy, cheap wash either. It’s a nice heavy, luxurious foam that lathers well and really breaks up any residue for a superb clean. I highly recommend you use the foam wash instead of just using a mild soap; this is actually designed for the product and it will leave your disc squeaky clean while being gentle for your parts.