glue in grout

[jstpeter8]

I have removed carpet off a bathroom floor to reveal 35 year old glazed tile. I have been able to get most of the glue off the tile itself bu not much luck with the grout lines. I need something stronger than the biodegradeable stuff i've been using. Strength not a problem as i am resperator qualified and use one at work as i work with some pretty nasty stuff. thank you jim

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[Davestone]

Home depot has some floor glue removers in the flooring dept. usually, i like the one made by Jasco,in the black and red container.