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I had this same problem. It turns out the drain hose from the ac evaporator was completely missing. I suspect that whoever installed the sound system used the hole in the fire wall and removed the hose. I had to go to a salvage yard to find one for $10. After I put it on I removed the seats and carpet to get to the foam padding on the floor board. I let it dry for 1-2 days and reinstalled everything.
 

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I had the same problem here. The hose was actually disconnected under the glove box/passenger foot well and all of th condesation was going straight into the floor. Fun stuff.
 

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If its the AC water...
i had the same problem, there is a rubber piece right above the transmission shaft and it very hard to clean it. BUT, the Lexus tech just pulling that whole rubber piece out and it solved my problem. Also, this solution was free because they didn't have to do much.

i am here looking for sunroof water issue.
 
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