Why dont you buy the blue color cleaning fluid with cloth and wipe your aluminum body
and screen?
I use that method and my old macbook pro from 2010 still looks like new until today!

I wipe and clean my notebook at least once a month or everytime when i feel its dirty
you should too and it works! just don't scrub too hard, gentle wipes will do and you can
see the dirt and grime really comes out!

Cheers!

https://www.klearscreen.com/searchresult.aspx?CategoryID=4

Klearscreen the best, but replica also okay, just dont buy too cheap one.
I think spend about RM 20 or more is safer..