Grouted the walls and floor 2 days ago and cleaned them or so I thought. Spent most of yesterday trying to remove the residue. Tried scrubbing with water then Cif, only to see the staining when dry and looking at them at a certain angle in the light. The tiles are a glazed ( I think ) ceramic on the wall and a glazed porcelain on the floor. Being glazed I thought they would'nt need a protective sealer although annoyingly I sealed the stone border and had plenty of the stuff. Any suggestions for removing it ?? The grout used was Bal microflex on the walls and Bal superflex wide joint on the floor. I have bought some Fila grout residue remover for ceramics and porcelain, would this be suitable ??

Try a small scrubbing brush as well with the residue remover