Allow the Wite-Out to dry completely so it’s hard. Trying to remove wet Wite-Out from your desk may spread the stain.
Scrape the dried Wite-Out from the desk with your fingernail or a plastic putty knife to remove as much as possible. Wipe the desk with a damp rag to remove the residue.
Moisten a clean rag with a small amount of mineral spirits. Gently wipe the mineral spirits over any remaining Wite-Out until it is gone. Wipe over the area with a damp rag to remove the mineral spirits and remaining residue.