How do I delete custom Starcraft 2 maps?

Hey there, I recently tried downloading some custom Starcraft 2 maps, but didn't like them, so I'd like to get rid of them as they are clogging up my map list. However, I searched all over the place, but can't figure out how to delete them.I've read in various places that I have to go into some place called C:\ProgramData, but I can't find that anywhere on my computer at all. Argh, why couldn't Blizzard just have included an in-game button to delete custom maps?

Anyone? I really need some help here.

I don't have Starcraft 2, but ProgramData is hidden by default, which is probably why you can't find it.

If you're on Windows 7, just hit Start, and type C:\ProgramData in the search box. Hit enter and it'll open up. You can also do this from your file browser..type it in the address bar up top.

edit: Here's a tool to help you tell which map is which..as the file names are hashed.