How to remove rust stain from concrete floor

How to effectively remove rust stain on concrete floor? This video make use of the WD4D to remove rust stain effectively.

[@robert-oc6nb]

Does it work on a concrete driveway? More porous than the concrete floor.

[@CTBLiew]

I think it should works the same. Perhaps allow the WD4D to wet the surface longer.

[@user-tc4xr7kw1p]

Thank you. I heard to use wd40, but didnt really know how to go about it.
I appreciate it.

[@CTBLiew]

Yes. Amazing correct!

[@JohnCarroll-rd6hh]

Spot on... took two goes but works well

[@CTBLiew]

Well done! 👍🏼

[@thegogogocom]

Good

[@CTBLiew]

Yes 👍🏼