The Sticky Microfiber Screen Cleaner is very practical - use the microfiber (printed) side to clean your phone or eye glasses, back side for storing it on the phone. The Sticky Microfiber Screen Cleaner does not contain any adhesive/glue so it will not leave any mark on the phone or similar.
If used correctly, the product is re-usable for many times (daily use over 1 year!). If the patch gets dirty, just wash it with liquid soap, dry it out and use again.
NB! The patch is not suitable storing on silicone. Silicone rejects it.
Product you can buy here is Snoopy Crazy Love Sticky Microfiber Screen Cleaner. Rest of the photos are illustrative.