Forget about oven cleaner, get some caustic soda cyrstals usually sold as a drain cleaner in pound shops.
Cautic soda is bloody brutal stuff. You'd have to be very careful or you'd end up with a 24.8 or maybe a 24.6.
@Chris_Borneo started
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Cautic soda is bloody brutal stuff. You'd have to be very careful or you'd end up with a 24.8 or maybe a 24.6.