The W124 has the same arrangement. under the wiper is the blower, and behind the blower is the evaporator.

btw what did you use to clean it, (I dont require it as my car has the filters and the evap fins are shiny as new)

just for other users sake, Ive seen a very rapid expanding foam at a toyota dealership that is made for this purpose - it can really get through that grime - and I have literally seen a dealership use simple green HD or aerospace to wash the condenser and radiator fins. Made them real shiny and clean.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)