I do the same as you, I blow off the entire mower the after ever yard including the drives. I just do it with the blower. I don't like transferring crap from one yard to another. I only pressure wash once a year at the end of the season and never under the deck. When I do Pressure wash I leave the engine running and run everything until it's all dry.
Yep same here I dont like all that water setting rusting everything out. I blow the major stuff off with the blower, and finish it with the air compressor. If you wet it, and dont get all the grass off then it acts like a sponge holding the water in all those spots you dont see until its to late.