What is the problem with a slightly leaking roof?

[VonAubrey]

Here is an introduction to the specific reasons for roof leakage: Failure of the floor plug: There are several holes in the floor. When the plug embedded from above is displaced, the interior of the car becomes directly connected to the ground. During heavy rain, water can seep in from below. Lift the floor mat to expose the plug. If the plug falls off, water will enter the car from the road. Clogged drainage pipe: The most common cause of significant water leakage is a blocked drainage pipe under the front windshield. This often occurs due to infrequent car washing or long-term parking under trees, leading to debris like dust, leaves, and mud being washed into the drainage pipe by rainwater.