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?
This sounds like it might be an OCD thing, especially given your reasoning. Do you you have other OCD like habits? OCD is relentless once it gets ahold of you, and can have seriously negative effects for both yourself and your loved ones. The earlier you address it, the easier it is to keep it from ruling your life.
This is my worry, also. These are not normal thoughts.