Kashering dishwasher

I have a home I’m staying in that has a treif kitchen. I know how to kasher most things like stove, microwave, countertops, sink. I don’t know the proper way to kasher a dishwasher. It is plastic on the inside. It has been left unused for more than 24 hours. I have washed it on high long cycle empty. I cleaned the bottom but not the filter since I’m not sure how to clean the filter. Could you explain how to kasher according to Sephardi halacha?

You did good. It’s good to go.

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