PSP TIP #1…
Go to your local good professional Optician and buy a Microfibre Lens Cleaning cloth. They’re like $10-20, but sometimes you can talk them into gifting you one with your new pair of specs.
One wipe and they remove all smudges off your Raybans… & other shiny black surfaces.
Best $10 you’ll ever spend on your PSP – you’ll not believe how bad fingerprint problem is.