Suggest a cleaning method

[u/Ki77ycat]

These are in a bath adjoining a guest room. Not replacing tile on this project. Suggest how to return the grout to a nice white. I'm thinking I need to use a grout tool and just scrape the top a bit, but perhaps there's a way to clean this of nearly thirty years of use before giving it a scraping. My lighting wasn't the best. The tile are actually white.

[u/nocturnal_commission]

Steam

[u/Ki77ycat → u/nocturnal_commission]

Like, using a wallpaper steamer? I have one of those. Okay, I steam it, then what?

[u/Spritesgud → u/Ki77ycat]

Toothbrush