How to clean the iPhone RAM? What drains the iPhone RAM?

My iPhone RAM is always used for more than 50%, that's 500 MB even if all apps are closed. What should I do to clean the RAM and use it for less than 50% ? What does the RAM use?

That 500mb is probally running the operating system. If the phone is old I would replace it

Your question makes absolutely no sense. You can neither "clean" nor "drain" RAM.

I don't think you have any idea what you are talking about.

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