[James pryer]

Hi all,
Anyone come across this before? Black staining on floor from which I believe is from Karcher RM760 carpet cleaning tablet of which I used to clean a mattress and some overspray landed on the floor. Which I wiped up but clearly not very well…

I’ve tried bleach, ubix, white wine vinegar fairy liquid and elbow grease but won’t budge..
I think it’s discoloured the flooring.
I am unsure if it is LVT or real wood. I think it might be real wood

Thanks