After washing my car today there was a plume of white smoke that came out after the start up. It was not the first start up after the washing but the second one, so I doubt it has something to do with water. It was the first time I saw smoke coming out of the car and I'm a bit worried. It seemed to me it was coming only from the right hand exhaust but I could be wrong. When I got out of the car to check it already almost stopped smoking. When listening to the engine I heard some clunking noise, like some piece of metal would be off. The noise was not loud though. Any ideas?