I always clean my Combisteam oven with Selley’s Oven Plus Gel. It’s the most effective gel I’ve used to remove the stains and grime easily and all without scrubbing. I always get it from Amazon as it is the most affordable:
https://amzn.to/4aHHZ1F
I always recommend descaling your Combisteam to ensure steaming doesn’t stop and for cleanliness.
I always get mine from Amazon here:
https://amzn.to/3QeOm4b
