How do you delete every item on a Halo 3 map in forge mode fast?

There is no ''quick" way. Either download a map or delete everything yourself. Deleting it all yourself can be more enjoyable though.

You have to delete all objects manually or you can download empty maps off of bungie's halo 3 website. In order for you to download halo 3 maps off of bungie you have to make an account there. Here is a link to a load of empty maps you can download to your xbox 360 through an internet connection.

http://www.bungie.net/online/communityfiles.aspx?t...

They empty maps are the ones that have the word canvas in front of them or in the description of the map it will say true canvas. Note: You have to be playing halo 3 to start the map download.