I don't expect that the oven cleaning experts on here are around on a Sunday afternoon (having cleaned their oven before they went out).
Oven cleaners can be AGGRESSIVE and you need to know which one will not make matters worse by removing the surface or something similar. So before most folk will answer your question, they might ask you a few things too. What sort of oven is it? What sort of 'hot plates' do you have? Do you have an instruction booklet? What is the make and number of the oven? Does the word 'katalitisch' appear in it?
Even if the booklet is not in English it might help members to find the best stuff to use if they know a bit more.
Coop and Migros will both have 'Kochplatten Reiniger' and 'Backovenreiniger' but, as I said, try to find out which one is suitable for your equipment before you try anything out.