I live in a rented flat that has unsealed (parquet) wood floors. I noticed there are a couple of old grey water marks on some of the tiles. I think they were here before we moved in but I would like to try and remove them. Obviously I cannot do anything like sanding or anything as it is not my flat and I cannot afford to buy a sander but is there any method or product that I can used to take out the water marks. The floors are UNSEALED and this makes a big difference. Thanks!

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