I had a rodent issue, so I went to one of those do it yourself washes and used the engine cleaner and then rinsed it with water. I drove it home and it sounded and worked fine. But the next day I started it up and since then it sounds really rough. The engine light has not come on and it seems to work okay, but the sound is pretty unsettling, worried its a time-bomb. Any thought would be much appreciated thanks!