Easy installation - no tools required
All my shields install quickly and easily with the use of peel & stick Low Profile Dual Lock Coins by 3M which are included.
Dual Lock works like Velcro but it differs in that there is no fuzzy side. Any 2 coins will mate together and hold your shield firmly in place. Removing the coins permanently may leave a little sticky but that is easily cleaned with any household cleaner.
Since 2006, no customer has ever contacted me with a problem removing the coins but for people who are really worried, you can substitute a product called Command Strips for the mounting coins.
You've probably seen Command Strips advertised on TV for hanging things like hooks and pictures. They work in a similar fashion to my coins but are designed to come off quickly and cleanly. They are available just about anywhere (supermarkets, drug stores, hardware stores, Amazon etc.)
IMPORTANT: CLEAN YOUR WINDOWSILL THOROUGHLY BEFORE INSTALLING.