Replies

1. 
   zak | Jun 04, 2006 03:14am | #1

   I would try the muriatic acid.  Not full strenght, mind you.  pour a couple gallons of water to the bucket, then add about 10% of that volume of muriatic acid.    wear gloves, and have lots of ventilation, cause the stuff does not smell nice.  scrub with a stiff nylon brush, dipping in the acid solution often.  The grout between the tiles should fizz just a little bit.  If it's not fizzing, it's probably not doing much for you.

   10% is a place to start, gradually add more if that doesn't work.  I wouldn't go any stronger than 1:2 HCL to H20.   Acid wash is only effective on concrete for a limited time, if it's too far cured, this won't work very well.

   zak

   "so it goes"

1. 
   redtoolbox | Jun 04, 2006 03:23am | #2

   Thanks! I grouted the tile 3 days ago. Do you think there is still a window of opportunity?

1. 
   Danusan11 | Jun 04, 2006 03:40am | #3

   yes, work away, I've used scotch bright pads also. if these have a glaze finish be careful using pads.

   Next time seal tile before grouting

   Edited 6/3/2006 8:42 pm ET by Danusan11

1. 
   redtoolbox | Jun 04, 2006 03:56am | #4

   thanks for the advice.
   dave

2. 
   zak | Jun 04, 2006 04:25am | #5

   I'd say there's hope for you.  Get going on it ASAP though.

   With some stones/tiles a wire brush will work, but often it will leave marks of it's own.  I would try it as a last resort, in a hard to see area.zak

   "so it goes"