Rattle was the wrong word to use. It is a definite squeak from the two dash parts rubbing against each other. I haven't had any work done on the car. The squeak has just become worse over the time I have owned the car. I think the cold weather has made it even more so. The silicone spray sounds like a good idea but I would be apprehensive to try it unless someone else has done it without it causing any finish damage.