I been detailing for 8 years for a living. At the moment do it at Ford. I never cover anything even on my personal car. Spray the degreaser then spray it off and apply the engine dressing. I've done this for 1000s of different cars over the years literary 1000s never had a problem.. Spray away
What year of car do you have? With all the computer stuff I've been told you have to be really careful to not get water in those areas or risk frying the computer.
Also when you spray off the degreaser are you just using the old thumb at the end of the water hose method or a spray nozzle or pressure?
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