About 3 times a summer, usually the day before a TRA or VTR concours event, I pay my quarters in a self clean car wash and wash the car including everything in the engine compartment. I use the soapy product on everything and then the high pressure spray to rinse it off, I do everything except the top of the battery. I have never covered anything and it always started on the first shot. Except once when I found that the high pressure spray had blown the high tension cable out the top of my coil. Five seconds later, it started.