De-clutter/Archive

Hi!

I am looking to reduce clutter with my leads & potentials. Is there any way to archive "junk" leads, "closed" or "won" potentials? I have created custom views to exclude these but is there another way to deal with this that I am missing? Like archiving the info? My activities page has too much on it & I'm looking to just keep actionable items in it. Thank you!

Best,
Kristin