First, try and determine if it is the front or rear drains. Position your car somewhere where you can pour a small amount of water into the front drains and then turn car around and do same for rear. An inclined road or driveway is ideal for this otherwise you may have to jack car. If it is the front drain, and you suspect it is clogged on the bottom, loosen or remove the plastic fenderwell access panel and scrape dirt out. After I did that on each side, I positioned car, nose down on inclined driveway and carefully ran water into that area with the front doors open, from inboard. You can easily get a hose into that area. Then I let the car sit that way 'til it dried out. This is only going to be a solution if it is the front drains and is caused by blockage down in this area. Even if it is not blocking there, I think it is a good idea for every member to check that area for dirt that can hold moisture. I could not believe how much there was in my car. Good luck.
1999 SSE. 108K. Cleared Corners, Mobile 1, Energy Suspension endlinks. Ported and Polished LIM, NGK TR-55 Sparkplugs, 180 drilled Intense stat, Flow matched injectors, Intense FWI, Intense PCM, MagnaFlow Cat.