Noise when wet

Hello together Does someone know this phenomenon? When I wash the car or drive in the rain, leave it for a while, and then drive off comes such a funny grinding noise from the steering / motor. This is about 3 seconds to hear. Similar to when a tail belt is wet. Only this noise is a little louder and deeper. This has to do with the nose, because otherwise it never appears. What could it be? Uses a silicone grease cure in the engine compartment, where it looks like rubber. Thank you…