"Cannot clean them!" star star star_border star_border star_border Lovely idea! But I am just about to throw mine away as they look dreadful! I have had them over a year and I have tried to clean them dozens of times with a brush, oven cleaner, bleach, wire wool to no avail! Mrs Grimmond - 01 May 2021 support_agent A note from the team Thank you for your review. We're sorry to hear this, the discolouration won't affect the function of the oven shelf edge guards and they should last for years. Thanks again for your feedback.