 re: Rough as Ass Holes! | |
Erm, I'm not sure it's even possible to rake the grout out on preformed mosaics without damaging the tiles, cuz that's pretty much what you'd have to do normally, and I've never had to do that.
I'm pretty sure cement removal agents won't work particularly well either, but you could try something like Lithofin Cement Away, which seems to be a favoured product among the British forum users, in quite high concentratation (or undiluted), with a REALLY rough emulsifying/polishing pad (scotch brite type of material, but with abrasive properties). Bear in mind that you must try on some out of view spot first, to see if damages the tiles in any way, because it's a very real risk. You also run the risk of damaging the rest of the surfaces if you try that, as well as discolouring the grout.
Other than that... Retile the dodgy parts completely. That's what I'd do.
And oh; preformed mosaics made from regular ceramics (that's what they're normally made from in my experience) require you do grout faster, and wait less for it to partially set, because the tiles absorb alot of the water in the grout. When you've done the final cleaning, it might be a good idea to keep the grout slightly damp for a day or two, as it cures through hydration, which means the binding of water, and if the tiles absorb alot of the moisture, the curing slows or stops, causing the grout to be brittle. |