How do I remove rust stains on granite stairs?

IRON OUT

This product works well for rust stains. I've used it about 5 times with success: https://amzn.to/2PpcPXu

Hope this Helps! Jeremy - https://do-daddy.com

Outside? First treat and fix the rust so no more runs on it. Scrub with CLR or any other rust stain remover with a stiff brush. Maybe let it sit on it, follow directions of cleaner. Power wash.

Iron out should do the job. Do not use CLR. It will etch the granite.

You may find this article helpful https://www.hunker.com/12300148/how-to-remove-rust-stains-from-granite