Trashing Xtra Channels

Is there a way to quickly trash extra alpha channels all at once? We use spot channels to mark up for soft proofing and also use alpha channels to save mask selections so the extra channels add up after a couple of rounds of color.

If you've got a 2-button mouse just Right-Click on them and choose Delete Channel. Start at the top one and work your way through them quickly.

If you have a single-button mouse, try holding down the Control key and clicking on the channel. Otherwise, you have to click and drag them down to the trash can (bottom-right on the palette); or choose Delete Channel from the Command Menu (Upper-right arrow).