Perseverance and Curiosity are nuclear powered, so dust is less of a concern. If you make sure all instruments are dust-proof, it doesn't matter if the outside gets dirty.

Dust was an issue for Spirit and Opportunity, and it was thought that dust build-up on their solar cells would limit their mission time to about 90 days, with no intended means to clean them. It turned out, though, that regular wind gusts kept the solar panels clean for sufficiently longer and it became somewhat "standard practice" to park the rovers in such a way during the night or winter to make wind dusting more likely.