Remove the phone from the case
Rinse the case with warm water
Add a few drops of mild dish soap
Scrub gently with a soft toothbrush or microfiber cloth
Clean corners and edges carefully
Rinse off all soap residue
Dry with a lint-free cloth
Let the case air-dry completely before putting it back on
For yellowing, wipe with a paste of baking soda and water
For stubborn stains, use a small amount of rubbing alcohol on a cloth
Avoid bleach, harsh chemicals, and abrasive scrubbers