2000 cherokee front doors are rusting at bottom on the inside, even though the drain holes have always been clear, first what causes this, and second, any ideas where to get another pair of doors...thank you

 

well there are a numerous amount of things that can make your jeep rust... and you can get doors from a junk yard if there is one near by, and also search craigslist.. there are always doors on there and any other part for a cherokee

 

Most times road salt is what makes them rust.