300SE1993

Longshot here - Are there any common paths for water to get into a W124 when it rains? I checked sunroof drains, they are fine. I had someone sit in the car while I sprayed it with a hose. Did this twice - no water could be seen entering from anywhere. Removed the back seat, lifted up all the carpets and watched, checked everywhere and could not see any water coming in during the hosing down. I sprayed the water everywhere - all windows and doors, into the area where the hood meets the front windshield, all over the trunk seal, rear window, so on and so on. Really at a loss here. Sure enough, whenever it rains hard, there is water in the car the next day.

Looking for any suggestions on this.