(6) quart containers. PEN & INK REMOVER. Spot remover works on road signs, whiteboards, brick, Plexiglas, and vinyl. New! advanced formula eliminates spots and stains safely without harsh chemicals & toxins. Non-flammable and biodegradable. Water-based formula safely eliminates spots from almost any surface. Dissolves problem stains like: ball point pen ink, permanent markers, stamp ink, news print and more. Removes permanent marker from whiteboards. Also will clean whiteboard residue. Non-flammable and biodegradable. Not sold in CA.