How do you clean up tung oil that has dried on a concrete porch

Question

A neighbor's granddaughter got tung oil on her concrete porch while staining the front door. Unfortunately, it's been a few months now and I'm trying to help her find a way to remove the stain.
I tried paint thinner and mineral spirits which is what is recommended on the can for cleanup - but no dice. Yesterday I got some concrete and driveway degreaser, scrubbed it and then power washed it. Nothing so far has worked.
I suggested she might want to buy a nice outdoor carpet to put over it.
Any ideas on what might work?

HoneyDo · Accepted Answer

The Sodium Hydroxide helped to break up the dried tung oil but still left mottled blotches on the concrete. I followed that up with a muriatic acid solution and that solved the problem. I applied the solution to the wet concrete, scrubbed it in with a long-handled brush and then power-washed it. It looks great!

Correct answer by HoneyDo on November 26, 2020

Jasen · Answer

Caustic soda.
Sprinkle on and dampen to a paste, cover with newspaper and plastic sheeting.
allow to sit several days, sweep off, scrub,  and rinse off with plenty of water.
Danger: corrosive: Keep away from aluminium, Wear water-proof gloves and eye protection.  Wash with water without delay if you get any on you.

How do you clean up tung oil that has dried on a concrete porch

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