WD-40 is one of those rare successful products that defies basic branding conventions. Nobody agrees on exactly what’s it’s good for, since the product has over 2,000 documented uses (among them debugging windshields and removing chewing gum). Few people know what the name means, either (but just for the record, it’s Water Displacement, version No. 40.) Users still argue whether the stuff is a lubricant or not (in fact, it’s a mix of lubricants).