How do I remove blue stains from the cracks of my wooden floor? ?

I would try a little vinegar or hydrogen peroxide.

Peroxide. Be patient, put a little down, then reapply whenever it's dry. FYI, it took several days to remove hair dye from my carpet, but it faded a little with each application, until it was gone.

Hello. Do you know your manufacture of your flooring? I might suggest contacting them for advice to find the suggested most effective cleanser without damaging their products seal coat.

I'd use hydrogen peroxide with a small tooth brush and wash cloth and try to work it in to get it out. Do a little at a time to see how it reacts.

Toilet bleach, peroxide and vinegar are all drying to the wood. Once you get the blue out, consider rubbing in some oil to replenish the oil in the wood. I use wood oil, but vegetable oil will do in a pinch. Just put a tsp on a clean cloth and rub the cloth all around the area. I hope this helps.

Try a cleaning paste. I’ve used Norwex, Campanelli, and earth brite. Each does the job with no difference in results.

What is your flooring made out of?

Have you tried reg bleach that is. Lear try ina tiny spot on the blue

Magic eraser

It's a last resort, but when I have a stain or a spot where the color is gone on my floors that I really can't remove, I've used a furniture marker or crayon (they sell them at Home Depot in the stain aisle) to spot correct. I always test it in an inconspicuous area first for color matching.

What is the floor made out of?

Try some CLR

Make a paste of hydrogen perxiode and baking soda the baking soda is really only needed to make this a thick paste. You might need to repeat the process just let it sit on the stains for at least an hour.

Whitening toothpaste?

Since your floor is wood, you may not be able to get the stain completely out, get out as much as possible, it may have soaked into the layers of the wood. From there, get a caulking pen and color it to your floor's color.