A 7 oz. can of cleaning solution much like the Evaporator Cleaner. Designed for the purpose of allowing you to maintain a cleaner evaporator environment after the initial cleaning with the 9 oz. cleaner. You can do this easily by injecting the Refresher Treatment through the adapter that becomes a permanent fixture with the initial cleaning. The adapter is placed at a convenient location under the dashboard or under the hood (depending on your vehicle) where you can easily use the Refresher Treatment as often as you need. A single can will last up to 6 months, depending on use.