People may tell you that certain surfaces do not stain, but sometimes you may just spill the wrong mixtures and no matter what you do, you cannot seem to get the stain up. It may fade over the months and years, but you will still know that the stain is there. The next best thing is to just leave the stain and wait until you have some floor sanding done. When you do that, you will lift up all the old stains and make room for new stains. You should not try to use too many stain removals products on wood because it could damage the wood and that is the last thing you want to do. So try to remind yourself that when you do your next sanding of your floors that all the stains will be removed. That does not mean you should go around staining your floors though.
