I do

but I never use pressure washer, only mild sprinkle of water from garden hose on per portion basis (this will avoid over watering) . Wet some portion and then follow up with soapy rug (diluted dishwashing soap) and then rinse, then proceed again to other portion. Been doing this for about 3 years now, and does this once every month. Then start the engine for a while to whisk off water from moving parts, turn off engine and dry off excess water.
Just cover the alternator with plastic, all electrical sockets are water tight/proof anyway.
Sa casa nakita ko ang ginagawa nila eh tire black using paint brush lang. Mukha lang makintab pero hindi malinis.