What is the Small Hole Covered?

friends, today I washed the car at the gas stations, there was a car washing machine, I was in it while I was washing. I looked at the leg where water was dripping from where I came after the washing was over. I spotted a black plastic strip in a line on the edges of the ceiling above the place where the door was closed, and a hole at its end as small as an ant. water enters from there. with what can I close it? Would it be silicone?

I think black would be very compact

I would recommend silicone dayson brand black silicone.