how should i clean my mac and if i shouldnt

You don't and never use any application pretending to clean, optimize or protect your Mac. I said never! These application do more harm than anything else.

Just take care of normal house cleaning: Files, documents...

WD

There is no reason to ever install or run any 3rd party "cleaning", "optimizing", "speed-up", anti-virus or security apps on your Mac.  This user tip describes what you need to know and do to protect your Mac: Effective defenses against malware and other threats - Apple Community   

AikamTheAppleDude wrote:

how should i clean my mac and if i shouldnt

How to clean your Apple products - Apple Support