The easiest way I have found is too double up a big rubbish bag and put your oven trays in it.
Put in two cups of ammonia and seal up the bags. Gently turn over so the trays get covered in the ammonia and leave it lying flat. I sat mine outside as the bag did leak a little. The longer you leave this the better but at least overnight. Mine were pretty gross you couldnt tell that they used to be silver
In the morning I filled my bath with hot soapy water to clean them and the gunk seriously just fell off.
I have used the washing powder on them before with limited success but this was the best they have ever looked with very little effort.
Have used it on pots I have burnt the bottoms on too and it brings them back to new as well.
good luck






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but how much (approx) do you spend on your trays? Mine are all stuffed and I need new ones.


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