Admin list delete and model delete() method

Hi, I have defined delete() method in my model. I use it to clear cache and delete thumbs. When I delete an element in admin, in it's details (edit mode) cache is cleared and all thumbs are deleted.

But, when i want to delete several elements at once - checking checkboxes on the elements list - elements are deleted, but cahce and thumbnails aren't deleted, so my model delete method isn't made:/

How can I fix it?

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