Compressed air is step 1, most often this clears the passage. I also use a solid copper ground wire and slide it through the entire run of the drain.
This "tool" is inexpensive.
Go to a hardware store and purchase a five foot length.
Use a scrap of sand paper to deburr or round off the edges.
gently slide in and out working the wire through the entire length of drain.
since it is coppe it will flex through the bends and break up any clogs.
If I hit a more stubborn clog I rotate the wire gently to break it up.
Do not force it work slowly and the clog will release.
Best is a salvage yard.
If you havethe time and a voltage meter with Aligator clips,
I have removed wiring harnasses then
1. Disconnect battery
Wire brush male connections.
2. Trime a nail file to fit in female slots and clean with file
3. Connect Resistance meter (I prefer those that sound off when a connection is present) to both ends of wire,
follow each wire inspecting for cracks in insulations or worn areas, bend stretch and twist as you run the length of the wire. If the sound from the meter stops or needle moves. you found the bad wire or break in the wire.
I then replace the entire wire some just remove the bad area and splice wire together.
For splicing,
Cut and trim wire,
slide electrical shring wrap (one inch each side of splice length)on wire away from bare wire,
press wire together
Twist
If in car cover area around wire with aluminum foil
Flux the bare wires
solder with a conventional soldering iron and leaded solder
slide electrical shrink wrap over the bare wires,
heat to seal
It is only time and this process is easy when done on a junk yard harnass then when complete, install in the car.
I mark the wires with a paint pen when they check out ok.
Be systematic and careful and when don slide a cabel sheath over harnass
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