Hello, since my C70 had squealed the seals of the side windows, I thought that I should lubricate them. My mechanic colleague said that I should smear all the seals (also of door and roof) with silicone grease. So I did that and what should I say: All crackling and squeaking noises are passé!! Now there is really silence inside with closed roof. Always thought, the noises are just because it is a convertible. Now I will repeat this every 6 months. Vlt. helps one or the other. Dear greetings from the convertible weather Schwiiiz Peter