CleanMyMac finds cookies Safari indicates it has cleared

I very must 2nd the sentiments of the previous contributor

To add

Any Third Party Applications that will interfere with the normal operation of the OS,  is an invitation for disaster. 

Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a percentage on each sale. 

What the Application may do to the computer is up to the User to check this out before purchase

Any of the below should be removed as per Developers Instructions 

Disk Cleaner 

CleanMyMac , aka “ BrickMyMac “

To put the Third Party Disk Cleaner / Optimizer in context and the damages it may have or has already done.

This type of applications can or will Muck Up your User Account ( Home Folder ) of this machine.

It does not touch the Operating System itself unless you consider your User Account ( Home Folder ) as part of the Operating System.

The Operating System may be  hosed

Safari tries to prevent third party apps from goofing around with its files. So, not a real surprise CMM couldn't clear them.

And why are you bothering to delete cookies anyway?

Why remove CMM? Because it's practically malware itself. Owl-53 already provided a link for you to see how often this app botches Macs. Here it is again.

CleanMyMac , aka “ BrickMyMac “

Are you sure CleanMyMac is accurate? Why?

Standard warning: Never install any app that claims to “clean up”, “tune up” or “speed up” your Mac. These apps exist for one reason: to extract money from the wallets of the inexperienced user. What they do can be done in other ways, and mostly what they do is unnecessary, but sounds good. Unfortunately in the hands of an inexperienced user they can do a lot of damage to a Mac OS installation. Avoid.

MacOS is the most secure operating system on the market. Privacy is at the very core of all Apple products and services.

I would advise against installing anything that interferes with that.

Don’t be fooled by clever marketing advertisement tactics that rely on fear to sell you a solution to a problem that doesn’t exist.

Many of us have been here for many years and have seen the unsettling results.

All the best! 👋🏼😉

Mahalo in Hawaii

OP wrote " Please direct me to a reputable source regarding CMMac — and/or any 3rd party app interfering with macOS — and I will read it (and take action) "

Let me answer your question with a question

What exact Sources will the user ( you) accept a Reliable Sources ?

Once we get that out of the day

We will do our best to comply with your specific request

Before we and I mean the collective we as in all who appear in your question

Judging from the combined Years of all 4 Contributor equals approx. 80 years combined of experience across multi disciplines

When that much experience is brought to bear on the usage of CMM BrickMyMac

Normally that would be testament in itself

This does not preclude your request once you have defined what are Reliable Sources

+1

🦉-53

+ 1

🦉-53