I have a problem with unsealed kitchen grout on ceramic tile as it has never been sealed and dirt has allowed to set in. In addition it probably needs regrouted later (pictures below) but sealing it could prevent damage and allow it to be addressed in the future when there is more time.
The issues is I don't know what chemicals I can or should not use nor how to clean unsealed tile without causing more damage. I would normally use professional strength products but I'm afraid it will damage the tile and/or grout as I'm inexperienced with cleaning unsealed grout.
The picture below provides below give indication of the status of my grout. I would appreciate any advice.
Another thing I would appreciate from an expert is assurance that grout is porous and that some stains will "soak in" and not come out despite how much of cleans them thus eventually requiring more reason to regrout much later. I need this "assurance" to accept it and move one.
I'm hoping professional tile layers will answer but all opinions and advice are appreciated at this point. I want to thank anyone who takes time to respond. If possible could someone confirm if it will need regrouted later?
Pictures can be found at Imgur