Oxalic Acid is widely used as an acid rinse in laundries that come with an effect in removing rust and ink stains as it converts most insoluble iron compounds into a soluble complexion. Oxalic Acid is a reliable and effective cleaner that is used in appropriate applications that may be used to remove rust and other difficult stains from areas such as buildings, concrete driveways, sidewalks, iron machinery, boats, swimming pools, wood decks, stairs or trim.