Stain removal help for colored concrete after merbau fence staining

[Favorite.gardener]

I recently had some concrete done in a charcoal color and built a merbau hardwood timber fence and gate over it on the side of the house. after a heavy rain, the merbau hardwood had stained the concrete. I haven't oiled the timber yet, and now I'm dealing with this stain, how do I remove the stain from the colored concrete without damaging it?

 

[GiantBread]

If you don't want to damage it, use a gentle cleaner or even solution of baking soda and water, don't use harsh chemical on it