I just don’t want to mix them because I feel like it would make me less clean.
Relatedly, what’s the best way I can follow the Patrick Bateman skincare routine as a simplified version that’s actually practical to follow and contains the most important steps?
No. It’s not normal at all. But you do you. No one is normal.
But I would be more worried about having OCD if you are worried that (not) using separate towels for your hands and face makes you less clean.