It is possible, yes, but on one condition. You should not use 3 in 1 or 5 in 1 tablets because they contain additives that attack the chrome bath present in all range hood grease filters. Therefore, if the filter is not stainless steel, it is better to avoid the dishwasher. If the filters are metal, it is advisable to put them in a basin with lukewarm water, some neutral soap and one or two caps of ammonia. Leave to soak for a few hours until the grease has softened properly. Then rub it off with a soft sponge and rinse with lukewarm water. And voilà, the filter of your cooker hood is like new!