letter no. 1
Will cleaning the engine bay damage the electronics?
the desk replies — Done properly, no — done with an open pressure washer, possibly. The professional method covers the battery, alternator, fuse box and air intake, uses degreaser with brushes and only low-pressure water or steam, and works on a cool engine. Water forced into connectors can cause misfires that appear days later, which is why method matters more than products here.