ac evaporator leak
 

Hi everyone i got a 1992 camry xle 2.2, i have a leak on the passenger side, it's not wáter nor antifreeze, smells weird, and it's kind of oily, i got the glovebox out, but how can i know wich part is the bad one, it can be the evaporator, the expansión valve, the lines ? how can i diagnose ? it's not the little black hose, the liquid is coming from the edges of the black plastic cap of the evaporator. And i also got out the heater core, so, don't know what to do now.