Since the system is open, I would just remove the condenser so you can REALLY clean it. I blast them out from the radiator side with a pressure washer.
Pick up a comb too, they are about $6 at Harbor Freight. Straighten the fins after you spend a few hours picking the bugs and rocks out. This is by far one of the most tedious operations I have ever performed.
The time spent is worth it.
OH - Buy a can of this for the car too. Helps clean out the evap core without removal.
https://www.ackits.com/pc/6984TSI/coretreatment/6984TSI+-+Evaporator+Odor+Eliminator