The Carpro, Gyeon, Gtechniq tar removers all work very well. However, they do not come anywhere close to the cost effectiveness of Tardis. It works great and is so cheap. I mainly use Stoner's Tarminator. The Stoner's XENIT also works really good but is more expensive. If you google 'citrus tar remover' you can find several brands of strong tar removers. There seems to be a real need for tar removers for truckers and industrial equipment