Use a dry erase marker to write on your big check, and do not use a permanent marker (unless you only plan to use it once. Dry erase markers are available in a wide range of colors and sizes so you can get one that is easy to write with and use it multiple times.
To clean the check after you write on it, wipe it with a dry cloth. You can also use a slightly damp cloth, ammonia-free window cleaner, or dry erase marker cleaner if the marker is hard to get off. Make sure to let it dry completely before you store it or write on it again.