This product is a unique cleaning foam designed to effectively dissolve road grease, dirt, oils, and debris that accumulate on the evaporator fins in your car. This debris is the source of foul odors circulated by your ventilation system. A mechanic or A/C technician installs our patented nozzle to inject the cleaner directly into the evaporator core case. It foams up to completely fill the evaporator core and casing where it cleans off bug parts, pet hair, nicotine residue and other contaminants. The Kit includes a can of cleaner, the injector system required to effectively place the cleaner into the ventilation system, instructions and a can of DWD2 Refresher.