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Is this sanded grout? Post a picture of the staining.
Ron
Travertine is a very porous stone, it's very possible you will not get the stains out. You might try muriatic acid in a diluted state.
Do this first on a scrap piece of marble. Set up the scrap the same as your tile job. Seal it with the same number of coats and use the same technique grouting as you did on the wall. Let it dry for 24 hours and try the acid. Try a 6:1 ratio at first. That's one part acid to 6 parts water. Add the acid to the water when you combine the two. Do not add the water to the acid as it will react and spit the solution up in your face.
Wear protective eyeware and gloves. Wear long pants and shirt. Have fresh water nearby incase you get it on your arms. It will burn you even in the mixed state.
If the acid reacts with the stone, stop the experiment and go to plan,"B".
Which would be to try each and every tile grout cleaner, one by one.
Ron
 
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