Boy that is cleaning it to the last possible trace of dust!As for electrical once a year after washing and drying disconnect all the electrical connections, soak both sides with WD40 (Water displacement), wipe off excess, let drip dry for a while then reconnect. I spray the entire engine, under the dash, the relays and even remove the ignition key and with a nozzle, spray WD into the key slot. WD will dry without collecting dirt and dust but, still leave a film that protects. To aid/speed up drying, start it up and allow to get engine warm (not hot) then shut it down. Electrical connections as a rule need to be clean, tight and dry. The beauty is no more bad electrical connections and all will come apart when needed !