Microfiber Screen Cleaner is very practical - use the microfiber (printed) side to clean your phone or eye glasses and the sticky back side for storing it on the phone. The 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 Microfiber Screen Cleaners not suitable storing on silicone case, silicone rejects it.
Product you can buy here is Snoopy Angel Microfiber Screen Cleaner. Rest of the photos are illustrative.