Does anybody have any idea of an eco friendly wood stain remover!

My mother is a big time Eco friendly product fan. She is an environmentalist too. My parents anniversary is coming up, and since they both care for the environment so much, I just found out that there are products which are Eco friendly and help to clean stains. I know they do not have it, and we recently moved into a new home which has wooden flooring. This product helps clean stains of wooden floors. So, could you please tell me the exact name for the Eco friendly wood stain remover. I do not know which brand it was.