Flipper Zero tips
For screen protectors I use:
Sensei Cut-to-Fit Soft LCD Screen Protector available on Amazon. I use these for all my screens such as on scanners, multimeters, etc.
On the Flipper's IR window, I just put a piece of Scotch tape. If the IR device is relatively close it works fine, if it's farther away I peel back the tape and lay it back over when I'm done, when it wears out I use a new piece of tape