third party tool to clean hard drive

Avoid most third-party "cleaning" applications. They have a nasty habit of telling you to delete things that your computer needs in order to function.

Never install any product that claims to "clean up", "speed up", "optimize", "boost" or "accelerate" your Mac; to "wash" it, "tune" it, or to make it "shiny". Those claims are absurd.

Such products are very aggressively marketed. They are all scams.

They generally operate on the flawed premise that a Mac accumulates "junk" that needs to be routinely "cleaned out" for optimum performance.

Trial versions of those programs are successful because they provide the instant gratification of greater free disk space.

That increased space is the result of irreversible destruction of files, programs, or operating system components normally protected from inadvertent alteration or deletion. The eventual result will be unreliable operation, poor performance and random crashes that may not become evident for months or even years after their use, when updates to programs or macOS are eventually released.

Memory "cleaners" that circumvent macOS's memory management algorithms work by purging inactive memory contents to mass storage, which can only result in degraded performance and accelerated hardware failure.

The above is a quote from a wonderful article:

Effective defenses against malware and ot… - Apple Community

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third party tool to clean hard drive

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