If your grout is not synthetic, vinegar and a stiff brush should work a hard tooth brush or even a nylon pot scrubber. You will have to put a little elbow grease into it. That could be tough.
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How do you remove dried Tile, Stone, Grout Sealer (brand Miracle) that got on the glass shower door and then how do you remove from the polished nickel fixtures?
If your grout is not synthetic, vinegar and a stiff brush should work a hard tooth brush or even a nylon pot scrubber. You will have to put a little elbow grease into it. That could be tough.
Try a wire brush. Good luck.
D, if you click on "explore projects" then "clean" then "bathrooms" then "grout" you will find quite a lot of helpful hints and methods. I have chosen one for you, but there are many more. I hope one of them helps you. Good luck with spring cleaning! https://www.hometalk.com/diy/clean/bathroom/how-to-clean-grout-and-install-new-grout-that-won-t-stain-23803774
How to Clean Grout and Install New Grout That Won't Stain
Dremel works good if its a small job