For those of you with vacuum operated accessories (i. e. PressureLoc), be careful when cleaning your engine bay. I used Castro Super Clean a couple weeks ago and all of the sudden my PressureLoc quit working. So, today after cleaning big blue up, I decided to take apart the solenoid valve and see ifn I could fix it. Well, low and behold, as soon as I popped the case apart I saw white dust and a stuck plunger. I figure what happened is that I went for a drive after cleaning the engine bay to dry everything off and the intake for the valve sucked in some of the cleaner. That night it dried, and blammo! Stuck plunger. So the morale of the story is wrap your vacuum valves in plastic or something to protect them when cleaning the engine bay. Nuff said.