From the Manufacturer:
Since 1979 people have relied upon The Original B&J "The Masters" Brush Cleaner and Preserver to take special care in cleaning and conditioning artist brushes. The formula is non-abrasive, yet effectively removes paints including oil and acrylic, as well as inks, dyes, grass stains, grease and grime. Just add water to activate the cleaning and preserving formula. Made in the USA, AP Approved.