How do I delete alias files on my macbook pro?

when i go into finder and im on all my files there are files that i dragged to the trashcan and deleted but they are still there only with a blank icon now, and it doesnt let me drag them and when i click on them a message pops up saying "the alias.... can’t be opened because the original item can’t be found" then i can delete it, fix it, or just click okay. and when i click delete/fix it just pops up again. how do i get rid of these?

also when i right click on downloads, the same thing happens, something i moved to the trash and deleted is still there, the alias thing doesnt pop up but when i try dragging it to the trash it lets me drag it but it doesnt go in the trash, how do i get rid of these? please help.

and i know windows has something called "clean up" that removes hiddin files that you thought you deleted and stuff and just cleans up you computer, does mac have any of that?