Ideally, if your plancha plate has not yet cooled completely, pour hot water over it. This will loosen sticky residues more easily and you can then remove them with a spatula or wire brush.
It is advisable to rub it with some sunflower oil afterwards to give it an extra layer of protection. Do you have a cover (you get it for FREE with every Plancha BBQ Grill)? Cover it (after your plancha has cooled down completely) or put it in a dry place.
Maintenance tips:
After use, pour hot water over the steel plate
Loosen sticky/baking residue with a brush/spatula
After cooling, rub the plate in olive or sunflower oil
After cooling down, place protective cover or put it in a dry place
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