What is the method to unclog a sunroof drain pipe?

[FinnLee]

Here are the methods to unclog a sunroof drain pipe: Syringe Injection Method: Use a syringe connected to an infusion tube. First, extract the accumulated water from the drainage channel to avoid backflow when injecting forcefully. After removing the water, fill the syringe with clean water, align the outlet of the infusion tube with the entrance of the drain pipe, and control the pressure based on the resistance encountered during injection. Once water overflows, use the syringe to suction out the dirty water mixture. Repeat this process several times to unclog the drain pipe. Air Gun Blowing Method: Utilize high-pressure airflow to clear the drain pipe. When unclogging, wrap a piece of cloth around the nozzle to prevent splashing dirty water from staining clothes or the vehicle. Avoid setting the air pressure too high, as this may cause the rubber connector and drain pipe to detach, leading to more severe leakage issues. After blowing, pour clean water into the entrance of the drain pipe and check if water flows out from the outlet near the tire mudguard. If water is observed, it indicates successful unclogging.