Removing cat dander from unit

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I’ll be house hacking in a 3 unit soon, and the unit I’m moving into is currently occupied by a tenant with a cat. My girlfriend is really allergic to cats. Does anyone have any experience with successfully removing cat dander from a vacant unit?

I’ll have a few weeks to a month after the tenant moves out to do this. I figure I would deep clean, repaint and run a hepa filter during this time. However I’m still a little worried about it, especially the ducts and various crevices in the unit.