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When I wash my car I have a "clean" MF towel which I use to dry most of the car surface and a "dirty" MF towel which I use to dry the rocker panels, wheels and exhaust. I also use the dirty towel to wipe down the engine bay every time I wash the car.
Depending on how hard your local water is, if you hose off the entire engine compartment you could leave water spots on any surface that you don't completely dry off which could be more unsightly than just dust which could be easily wiped off, especially with a little spray-on engine bay dressing (Griot's Garage).
My last car was an S2000 that I had for 13 years and 90,000 miles. When I sold it to buy my M the engine compartment looked like brand new.
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The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4  | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12
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