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i spray it once a week for the last 3 years..... only thing i cover is the air filter! i coat everything with the tire foam too.....never burnt or stink....all i can say is try it!!!
I have just seen too many threads on too many forums of computers getting wet... ask any detailer if they soak an engine bay down, I am guessing 99% say not without covering electronics...
thats all I am saying, it may work out great and never be an issue... Not everyone may have the same luck though...
I used degreaser on mine, i forget which brand, and it completely screwed up everything. It looks faded and stained. It's horrible. Stick with what these guys recommend.