Had karndean knight tile laid in the kitchen about ten years ago...I suspect I've cleaned it with random floor cleaning fluid at some point which I found out later you're not meant to do, you're meant to use karndean very expensive floor cleaner.
Anyway, it's just really dull and grubby looking even when it's clean. Is there any way of rescuing it? I really don't want to fork out for a new floor just yet.