To remove dark water stains from wood floors you have two options.
Cleaning stained hardwood floors.
Do a second round after several hours and let the area rest until the next day.
The result should then be sprayed and wiped onto the exposed surface of the floor.
Do not shake but gently mix this then mop or.
Rub out stubborn grease stains with a cotton swab moistened with peroxide followed by a second swab moistened with ammonia.
For how to deep clean hardwood floors consider doing this cleaning in the spring or just before the winter holidays use a wood floor mop and wood floor cleaning product diluted according to the label instructions.
Then make a cleaning mixture using 4 cups warm water and a few drops of castile soap or dish soap.
These finishes easily absorb water and water can warp wood floors so use only solvent based cleaning products instead of water based ones on floors with penetrating finishes.
Bleach might have been used to remove the stains from your white clothing but it can do a great job at removing hardwood floor stains as well.
Soaked two cotton pads with peroxide laid on stain for 2 full days checking every 8 hrs or so to be sure the wood was ok.
Begin by dusting or sweeping your floors well.
Saturate a sponge or rag mop in the water then wring it almost dry so it feels only slightly damp to the touch.
The procedure for removing dye that has penetrated the wood is similar to that for removing black water stains but after sanding off the finish use chlorine bleach to remove the dye.