Rust Stain On Quartz . One way to remove rust stains from quartz is to use a mild abrasive cleaner. 4) if that does not work, try this method to remove the stain. How do I remove these rust stains from a quartz countertop? Tried from www.reddit.com There are also rust neutralizers (loctite makes one); If you have a metal rust stain on quartz surfaces, first soak a cloth with oxalic acid or bar keepers friend. Allow 10 to 15 minutes for the saturated.