Since they came in a two pack i put the second one in my car and use it to remove the film from the inside of the windshield and it does a good job at that task as well

Doesn’t work on chalkboard walls almost at all just gets some dust off but otherwise completely leaves the chalk there not sure what to say here other than they are exactly what i expected

Theres not much to say except it removes chalk from a chalkboard and does a good job of it