After driving home from work and parking my MM at home for about two hours I started it back up an noticed blue smoke comming form the tail pipes. I had just finished cleaning the engine bay and wiping down the dirty items in the engine bay. All I used was a damp cloth, and then went back with protectant wipes and cleaned off the plastic pieces. I was told that because of the pressure of the engine that the premium fuel that was in the cylinders was not burned off, and when I started the car it was what was left that caused the blue smoke. I reved the engine a couple of times and no other smoke. I turned off then turned back on the car and no new smoke. This happened on Friday and hasn't happend since. Also when I turn the key on and off with out turning the engine on I hear what sounds like a creeking door comming from under the dash on passanger side of the car like almost behind the climate control center. Any thoughts would be greatley appreciated. The only mod is the 90 watt whelen hide a way strobes. There is only 17K on it.