Execution order
1. Regularly clean the water drainage holes at the bottom of the door channels and in the underbody frame stiffeners with a pipe brush. Often these holes are clogged with dirt or anti-corrosion agent.
2. Next, check both water drain pipes at the bottom of the "wet box" between the windshield and the engine bay. Dirt can accumulate here.
3. In a vehicle with a retractable roof, additionally check the roof drainage holes (see above).
4. For cleaning - at the front at the top, at the back at the bottom - an old speedometer cable is suitable.
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