I have some kind of metallic scrunchie with special soap in it, if you want to try it, come and I’ll give you one (sure you can find it here, but my mum got it for me in France).
I have at the bottom of my oven an oven liner bought in ALDI for 5 euro or so, and it’s better than brilliant.
You remove it, it’s non-stick so very easy to clean.
I clean it on my kitchen top, no need to bend and reach the bottom of oven, then I put it back on.
I had one for years, and the one from Aldi is better.