I have experimented and have this process perfected.
First remove the tempered glass carefully
Have a bowl of water with dish soap in it(dawn etc...)
Dip the protector in the liquid while rubbing it with your fingers while under soapy water
Remove it from the bowl holding only by the sides and making note of which side is the screen side
Run it under a faucet to remove suds
Sit down with a hair dryer and blow dry it on high blower and medium heat while shaking water off. It should only have a few drops of water on it when done and not totally dry.
Place it on a clean phone screen then apply as normal and push any air toward the side or bottom. I have re-used one of these 5 times before without issue with great results
First remove the tempered glass carefully
Have a bowl of water with dish soap in it(dawn etc...)
Dip the protector in the liquid while rubbing it with your fingers while under soapy water
Remove it from the bowl holding only by the sides and making note of which side is the screen side
Run it under a faucet to remove suds
Sit down with a hair dryer and blow dry it on high blower and medium heat while shaking water off. It should only have a few drops of water on it when done and not totally dry.
Place it on a clean phone screen then apply as normal and push any air toward the side or bottom. I have re-used one of these 5 times before without issue with great results