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Might depend on what material it is made from. I have a leather shell case and have had no need to clean it yet as it just looks better and better as the days pass. However in the past I have cleaned my leather cases with the same leather cleaner I use on my leather furniture and the results were fine. A non leather case would probably do fine with a damp cloth. I don't think I'd use anything to harsh on the cloth, just damp from water and some elbow grease as needed.
 
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Depends on what type of case you’re referring to. But for the majority of my cases, they don’t usually get dirty, I just use a microfiber cloth to wipe them down and that is more than enough to remove any type of debris or lint.
 
Depends.

Hard, clear polycarbonate - rinse/flood in the sink and dry with a lint-free cloth.

Apple cases - can of compressed air on the microfiber, damp lint-free cloth on the silicone/leather

Ultra thin, fragile 0.35 mm plastic cases like what I use now - light compressed air followed by very light damp lint-free cloth inside followed again by light compressed air.
 
Full immersion and scrub in soap and water.

This is something that gets touched daily with a lot of foreign microorganisms.
 
I've been using TPU cases for a while now, and since they can be had on the cheap, I don't get too concerned on what I use. So...

On the outside, not unusual to use multi-purpose cleaner and paper towel to get off the oils, schmutz that can get on the back. Inside, like others have posted, canned air and lint-free cloth to get out anything that snuck in. Will use lens cleaner on the phone back and the inside of the case.
 
Apple leather case I don't use anything as it's leather. Any TPU case or other material I use electronic wipes I get at my local Walmart.
 
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