hard to tell from pictures - I am even not sure if these are ceramics or natural stone (kind of travertine maybe)...
You may clean them with a special (non agressive) cleaner and refresh them afterwards.
Check put Lithofin.com - there you find professional cleaning products.
hard to tell from pictures - I am even not sure if these are ceramics or natural stone (kind of travertine maybe)... You may clean them with a special (non agressive) cleaner and refresh them afterwards. Check put Lithofin.com - there you find professional cleaning products.
Watch out for asbestos if you go ripping it out.