Tile lab tile cleaner. Something very mild. Don't use strong vinegar solutions. Honestly Cinderella method is best. Hands and knees and two buckets and a regular ass hand scrub.

Hmm I’ve never heard of this product but I’ll look it up thanks for the reply!

If you don't get an answer here, check out some of the old house subreddits. I know exactly what black iridescent tile you are talking about as my parents had it in their NE rowhome (that is, until it was removed during a Bath Fitters remodel :( )

Oh that’s a good call. I figured I’d try Philly first because of exactly that instant recognition of what kind of tile I’m referring to! Now I’ve got the Bath Fitter jingle stuck in my head…haha

https://instagram.com/vintagetilepreservation?igshid=Yzg5MTU1MDY=

Thanks but I don’t have Insta so I can’t see much!

Oh so sorry! They are mainly on the West Coast but recommend not using harsh cleaners to preserve the grout and have a tool to remove the grout if it's needed. Congratulations on your beautiful tile!

Oh thanks! Yes I think the moral of the story I’m getting is elbow grease over chemicals for cleaning!

There's no need for cleaning with chemicals if you get yourself a steam cleaner (we have a mop one and also one that's a bit like a drill. Honestly, they lift any stains, it's like pressure cleaning the deck, except it's just blowing the beige/black out of grout lines. They do have high pressure modes but that's more for stubborn corners you can't reach, it's normally just hot steam and a brush, I've not bought bleach for years.

Oh damn you might’ve convinced me to get another gadget (I’ve been abusing my little green Bissel spot cleaner this past week on all sorts of carpet stains and it’s the best!!) Thanks for the recommendation.

can....can we get a picture of said tile? I love this kinda stuff.

What model(s) do you use, if you don’t mind sharing? I looked into getting one and found the variety a little overwhelming.

If they're porcelain tiles the tiles themselves are hard to fuck up.

Don't use acidic products like vinegar, it can destroy grout (and will etch natural stone like marble), but basic products should be fine.

Sorry, I'm on vaca right now, not back till the new year

There seems to be quite a few variants on the hand unit for doing taps/showers with, I guess they're all about the same

For floors there seems to be more of a range, possibly because you might be doing a small apartment or you might be doing much larger place.

If you're uncertain you could try going the Craigslist route, then if it doesn't work out you can resell and it won't cost you anything other than time and a few bucks gas money