Why does my hair brush get like this???

bianca

I swear I have the most greasy and oily hair ever since corona I literally have not been washing it like I used to it’s been 3 to 4 days between each wash and I’ve been barely using any heat. I don’t have any like linens that leave off texture or wear anything on my head so I don’t know where this lint is coming from? Any ideas??

*currently use Dove dry shampoo

Looking for recommendations as well !