I volunteered to give my sister’s oven a clean yesterday, as she didn’t have a clue (worried about breaking a nail no doubt!). So I turned up with my trusty soda crystals and a couple of copper scourers. “Is that it?!”, she said. I let her know that HOT HOT water would do most of the work. Left the racks to soak in boiling hot water and soda crystals whilst I had a cuppa and a natter. Then let copper scourers do the work. She felt suitably embarrassed by how easy it was!