I have run across them that looked pretty from the outside then I got out the water hose and it looked like a mud slide on the slab.
I was going to add for mo-flo to check if the coil is a double row job. But then I read about the evap having a cap tube so that made me wonder if the condenser is just as ancient (thereby unlikely to have double coils).

Last summer I split apart many of the condenser coils at my building. The amount of dirt between the two coil sets was astounding. Just washing the coil from the front or back without splitting it wasn't doing anything for all the crap in the middle.