bathroom

Did you try spraying on chlorine bleach @ 100% strength?

i tried clorex it did nothing

i would try these in the order.

1 - mr clean eraser sponge
2 - ajax/commet with a brush
3 - if the grout is indented between tiles, put grout on top of existing
4 - fine sand paper to carefully remove some grout. then decide if you want to add grout on top.

Try the SoftScrub that includes bleach. I used this with porcelain tiles where the grout yellowed.

did soft scrub work? i am surprised i did try clorox I Am going totry and find 100 per cent bleach i have never seen this before in a bathroom so strange

since SoftScrub got taken over by Lysol, it isn't as good as it used to be. can't hurt though.

i think it is a special cement not grout that went yellow

so is it between the tiles or behind the tiles?

between large marino white glass slabs and on the join lines from tub sides to front of tub which is also faced in glass there is very little space to dig out and replace compound clearly they used wrong material

Ali,

As long as whatever they put in between to act as a grout at least it seems like that i would try to use a grout stain, very easy to apply, if the substance is not porous who knows.

If you can email me a picture it might help

primerenovations@mac.com