Victorian Tiles

[katy]

Hi. I am new to the forum, and would really appreciate some advice if possible please. We have recently moved into a Victorian house that has what I believe is the original tiled floor in the hallway. Unfortunately it seems to be suffering from several years of neglect - it has old paint and plaster in a few places and was generally quite marked. I have given it a scrub with Lithofin tile restorer twice in the last week - both times have made a good improvement in the general appearance of a lot of the tiles, but there are still several patches of what look to be greasy marks, and now also I think I have created some salt marks following the washing of the tiles. Having done some reading, I think I might need to do an acid wash next - will this help with the greasy marks as well as the salt marks, or should I be doing something to help get rid of those before the acid? I would then also like to seal the floor to help protect it and maintain it (it's a heavy traffic area in the hall) - if someone could suggest the best sealer for the job I'd also be really grateful. Thanks very much, really appreciate any advice.
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Hi. I am new to the forum, and would really appreciate some advice if possible please. We have recently moved into a Victorian house that has what I believe is the original tiled floor in the hallway. Unfortunately it seems to be suffering from several years of neglect - it has old paint and plaster in a few places and was generally quite marked. I have given it a scrub with Lithofin tile restorer twice in the last week - both times have made a good improvement in the general appearance of a lot of the tiles, but there are still several patches of what look to be greasy marks, and now also I think I have created some salt marks following the washing of the tiles. Having done some reading, I think I might need to do an acid wash next - will this help with the greasy marks as well as the salt marks, or should I be doing something to help get rid of those before the acid? I would then also like to seal the floor to help protect it and maintain it (it's a heavy traffic area in the hall) - if someone could suggest the best sealer for the job I'd also be really grateful. Thanks very much, really appreciate any advice.

I've attached pictures of some of the worst areas