Here's a fix I found on another site and decided to try it out.

It's been found that after washing your JK or after a rain, the mirror bases can fill up with water and then take days to dry out or possibly leak into the doors through the mounting bolts. This fix took me about 3 minutes to do.

Using a rotary tool with a 1/16" drill bit I drilled (VERY SLOWLY!) about 1/4" below the horizontal arm of the mirror base and slightly rearward from the vertical center line and at a slightly upward angle.

Tools Used 

Finished Job

Credit goes to Rubimon for the original idea

Thanks Rubimon!

Just got back from the car wash after getting her a bit muddy and the drilled out holes work great. No more water marks from the mirrors. The water drained out almost immediately.

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Get in, Sit Down, Shut Up and HOLD ON!!!

Mine is usually to dusty, muddy or just plain dirty to see watermarks but I will actually pay this some attention and perform the fix.  I am doing this not because the water marks but rather anything that holds water causes rust eventually.  Thanks for the information.

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Going to do that tomorrow. lol good info.

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Just joshin ya!

I just found this site, and found great info too I will do this by the end of the week. this is a great JEEP SPACE!

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Drive It Like You Stole It!