Could the ash fall last Sunday have any effect on cars even if it was not used? I left my car in the garage Friday and when I started it Thursday, it was shaky for a few seconds (never happened before) Now the idling is lower than usual and feels rough. I am thinking of taking it to the casa for an oil change and general check up but the volcano might erupt again

Re the paint, I washed my car (using the proper process) for 2 days in a row after the ash fall and then I just gave up because it gathers dust daily