seems a tad bit elaborate. how about just going around them with rubber tape, and blasting it with a hose, then do the same without the tape?For those with Safari windows, one way to rule out if the water on the floors is coming from the windows and/or the associated drains is to use radiator UV dye and a UV flashlight.
Mix it with a couple gallons and let it flow…
Amazon.de : SLTG2020 UV Ultra-Violet 12 LED Flashlight Blacklight Light 395 nM Inspection Lamp Torch
The UV dye can also usually be bought at local auto parts stores.