Hello,
Thanks for your reply, thee mosaics are honed/tumbled.
I fixed them, then wiped off with a damp sponge, then after drying, I sealed them with Fila protector. Then I grouted them and again, sponged off as I went. Then I gave them 2 treatments with residue remover.
The mosaics are still a bit dusty looking in places and its real pig getting them any better. I was really careful to clean all the way along.