How can I clean all the junk files from my iMac so that it can run faster?

How can I clean all the junk files from my iMac so that it can run faster? Its been slowing down ever since I started using it.

Before doing anything, we might be able to help with your iMac issues here.
Please download, install and run Etrecheck.
http://www.etresoft.com/etrecheck
Copy/paste its report here in another reply thread so that we have a complete profile of your Mac's hardware and installed software.

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