cleaning carefully my mac

No Anti-Virus software or so-called “cleaning” apps are needed or recommended for Mac OS. They can conflict with Mac's own built-in security. At best they will slow your Mac by using unnecessary resources and at worst will bork your entire system.

As mentioned Malwarebytes is safe to use.

Mac OS X only: Keyboard Cleaner is a donationware application that kills all of your keyboard input and blacks out your screen so that you can clean up your keyboard without sending errant keyboard strokes.

https://lifehacker.com/download-of-the-day-keyboard-cleaner-mac-236631

https://discussions.apple.com/docs/DOC-2435

On my Displays I use Endust for electronics and microfiber cloths.

How to clean your Apple products

There are no Mac viruses. There is Malware/adware. Malwarebytes is normally recommended.

https://www.malwarebytes.com/mac/

MacTweak is definitely not alright. Do not install it.

I think someone should write an app called MacWindex that doesn't do anything, but the name should sell. 😎

edit: or Dr Windex

Or... unplug it... Or turn it off...

:)