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There might be a special wide chisel for that with heat. IDK. The structure is probably trashed.
In addition to grout sealer (silicone i think), you might want to use GelGloss spray wax when dry. Don't breathe it. Spray on the lines thick and wipe across the tiles. Buff. Keeps it nice and clean. Not too slippery. That's what I used when re-grouting my small white shower tile with sandable grout in a tube. Also a plastic shower with heavy calcium buildup and water spotting. Looks great afterwards. No problems so far.
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Meanwhile other things are still happening.
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