I cheated and bought a remote viewer at Harbor Freight, it is incredibly cheaply made but works just fine, it's designed to crap out or loose a part & stop working the *instant* you're not uber delicate with it but for looking in there it's fantastic .

I waited for a cool day and sprayed some foamy cleaner in there and let it soak a bit, flushed with the garden hose (use a nozzle or suffer the consequence !) and never a dribble on the carpets ~ every bit of crud went right out the drain tube everyone touches then complains when it crumbles .

As the evaporator is light alloy you want to try to find proper AC evaporator cleaning stuff so you don't cause corrosion .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better