To clean the inside, attach the gun cleaner like you would any other foam can. Pull the trigger on your gun and shoot out foam into a trash container until it comes out clean. Wait 10-15 minutes and repeat this process, as sometimes the Acetone needs time to work to dissolve the foam. Don't over clean the gun.
How do you clean a foam gun after use?
https://www.youtube.com/watch?v=lV_7KKCZ8Hs
How do you maintain spray foam insulation?
Conduct Regular Cleanings In order to keep your spray foam roof in good condition, clean it on a regular basis. Doing so will prevent debris from clogging the drains and standing water from accumulating. To clean your spray foam roof, start by using pressurized water at a maximum of 3000 PSI to remove any debris.
How long does expanding foam last in a gun?
Keep the can attached to the gun and do this every time, you will be able to use the same foam can up to a month or longer. As long as the valve is closed, air doesn't reach the foam, the foam doesn't cure.