Dave

some times this type of restoration work involves replacing damaged sections of the design , so great care needs to be taken because the old fixing methods were to butt joint the tiles together so removing sections can be difficult and also can loosen up next tiles in line and so on. just pointing this out as it is normaly a specialist job and i would leave it to them that do it day in day out, but if its just a cleaning job then follow mcp77,s advice.....dave..