I have just had a call from a property manager who I do a lot of carpet cleaning for. He has just taken over the management of a terraced house (which I have not seen yet).
He has a problem with a dirty stone floor. He thinks that (in the past - before his time) someone has laid porous (maybe) ceramic wall tiles on the floor of a house he has just taken over.
He thinks that general dirt, maybe even oil / fat has soaked in.
I am lost for ideas on this one. Is there anything that can be done?
He has said that if it is uneconomical, he would rather just put a new covering over the top.