This is a basic 10 hour experiment where we attempt to stain a light color quartz sample. Prior to installing expensive quartz countertops, my wife and I wanted to know how the material would stand up to its reputation as being very stain resistant.
Used to clean:
Dry paper towels.
Warm water and washcloth.
Soap and warm water on a washcloth.

I would like to thank our local fabricator: EXCELLENCE BY NATURE in Florence, Kentucky for providing the quartz sample to be tested.
http://www.ebngranitesupplierflorence...

Substances used:
Used motor oil.
Coffee.
Tea.
Brakes grease.
Orange juice.
Cherry juice.
Mustard.
Ketchup.
Olive oil.
Fish sauce.
Oyster sauce.
Soy sauce.
Graphite.
Red bean chili sauce.
Sriracha sauce.