poynton phil
TF
I had the same problem not so long ago, firstly i tried fila ex strong residue remover, but that just seemed to make the problem worst, as it took ages for it to work and sent the black grout white. Then i spoke to the rep at LTP, and he told me to use LTP grout stain remover and lightly scrub with a white emulsiifing pad, and hey presto clean tiles and black grout again, and it really does work