Clingy Motivational Signs

I placed these on a plexiglass 'covid barrier' that I was no longer using for its intended purpose. I now want to give the plexiglass away, but to remove these things from the plastic would literally take hours--they are THAT stuck to it. Prior to having them on the plexiglass I had them on my white board and they weren't so difficult to remove from that. So if you decide to invest in them, just know that they work better on some surfaces than others. It is also possible that they degrade over time and become more difficult to remove (I have had mine about 3 years and have applied them to two different surfaces during that time).