We recommend using Cleaner/Degreaser to remove general grime, and Oil & Grease Stain Remover for more deeply set stains. For more specific stains like efflorescence or rust that will be removed by professionals, we recommend Light Duty Concrete Cleaner. A clean surface will maximize the performance of Saltguard and Saltguard WB.
Here's a quick how-to video for using Oil & Grease Stain Remover. https://www.youtube.com/watch?v=q9obVHG9o-U&feature=youtu.be
As always, we are here to answer any questions you have. Call us at 1-800-255-4255, Monday through Friday, 8 a.m.-5 p.m., Central Standard Time.