Cleaning condenser coils of Danfoss Isotherm refrigeration kit

[workmaster2n]

I've got 2 Danfoss Isotherm compressor units that run my fridge and freezer. I turned off and emptied the freezer yesterday to get all the water out and turned the system on this morning. The compressor ran for 8 hours straight. I took a look at the fins around the condenser (I had to look down the fan intake) and noticed quite a bit of dust accumulated in the fins.

Reading about the units, it seems like Danfoss says to clean the unit with soapy water. My condenser is in a plastic housing though. Would that be alright if I shot compressed air down the intake fan (not upside down) to clear the dust into the cavity the compressor sits in (where I can then clean it up)?

Sorry that the picture is upside down. I tried inverting it, but it still shows up upside down. The fins are on the bottom right hand side of the picture, in the black box thing.

[Pete7]

Ours is 15 years old, never thought of cleaning the fins. Another job to the list