I messed up my skin and Now when I download it freshly it still shows messed up.

I lost my bold skin. So to update the skin i had to download it from my site. I went to edit it and Accidently messed it up by importing a image into the wrong section. Or something of that sort. I couldnt find the right image so I uninstall the skin and delete the folder but when I re download the skin from my gallery it still is messed up. How do I get rid of the catch files or whatever so that it dont remeber that?