A scubber pad with a bit of vinegar might do the trick...

Your friend needs to call the contractor back and you should do nothing.

I personally don't plan on doing anything. I'm just wondering what the cause could be.

Things are crazy right now, a lot of people are out of work and hurting... Which means people are more inclined to say they know how to do things that they may not actually have experience in. Like I said, judging from the looks of things, I'm not sure this guy knew what he was doing.

Obviously, she needs to call the guy back. But on the off chance that I'm right and he's out of his comfort zone, it would be nice if she could say something when she talks to him that could allow him to rectify the situation or not make the same mistake again if it needs to be redone.

I'm also curious, personally, about what the cause is and the remedy for it, if there is one, just for my own knowledge.

Nobody knows anything about the cause without knowing the process and products. The person who owns it should know that. If they don’t, they weren’t involved enough with due diligence and it’s likely just as bad as would be hiring a 12 year old hockey player to build you custom cabinets.

That’s an Unnecessarily unhelpful comment. Some people may well have experienced this before and be able to comment. As for due diligence you can hardly ask a tiler to prove they can do it before they do it.

Oh, you absolutely CAN require that a professional have professional certification that shows that they know what they are doing before they do it! That's just one part of due diligence. Just like requiring a MD from a reputable college hanging on a wall, rather than one bought and home printed from “Santa Gorda College of Wholistics”.

https://www.ceramictilefoundation.org/find-certified-tile-installers

Specific details are required. Some grout bleed on darker colored grouts is normal. Some is not. Some is an issue. Some is not. Knowing products and procedures is the only way to guess anything from this side of the internet.

Simply put....we need to know exactly what grout was used.

Just had the same problem maybe the joints were over filled and the groutthat won't stick to the ceramic is pulling off. I scrubbed mine and it quit bleeding just a thought

It was expired grout. That's all. Not everyone checks for that, dark colors don't sell quickly so it most likely was old stock.

ok, so that might be the cause, now what is the solution? should a sealant be applied to the grout or should the shower be regrouted with a grout that is not expired and a sealant applied.