You of course should never use dry erase markers on the SmartBoard but if it happens:
TRY TO REMOVE AS SOON AS POSSIBLE
IMPORTANT • Before you clean your interactive whiteboard, shut down or disconnect the
IMPORTANT: When removing dry-erase marker ink, do not use cleaning wipes, low-odor whiteboard cleaner or glass
cleaner, because they don’t adequately clean the surface of your SMART Board.
If dry-erase ink remains on your interactive whiteboard for a long period of time, you might need to scrub the ink with whiteboard cleaner
for as long as five minutes. Although a faint residue might remain, it isn’t usually visible when the projector is on.