At this point, I'd try some of that keyboard cleaner goo ... it would get in the crevices and then lift the dirt. It would be super time consuming though...

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https://imgur.com/a/xLc626W

You can tell the kitchen got a lot more action based on the grout color there vs the other spaces, except for the bathroom off the kitchen which looks even darker.

This is a good idea, but yeah... that sounds like a long project. Its a LOT of flooring to clean that way... see pics here https://imgur.com/a/xLc626W

Once again I am compelled to speak of my most prized product 😆. I splurge on 65% hydrogen peroxide. Always Use gloves. Usually Safe for stone and grout. Disinfects floor as well. Hand scrub floor one time with peroxide diluted 1/2 cup per bucket of water in addition to small amt of your favorite floor cleaner. After that, then mop as needed with your floor cleaner and 1/4 cup 65% peroxide in mop water. If you don’t want to spend on the 65% peroxide, the regular brown jug 3% will work ok if you use much more of it in your bucket. Like an entire bottle or more… way worth the cost. Once dry you should see a very noticeably clean disinfected floor.

Damn, 65%! I have 7% for my water softener, but 65% sounds gnarly. I'll have to look and see where I can find some.

So, businesses that post videos of themselves cleaning floors like this seem to use a commercial, truck-mounted hot water extractor. These are ... much more powerful than anything easily available to a consumer, because they use strong detergents, near-boiling water, and very strong suction to basically wash and dry the floor in one pass.

If I was in this situation, I'd shop around a few cleaning companies that have a truck, and then see if they'd give you a discount for coming out 3-4 times a year on a schedule.... or I would look into sealing the tile with something clear but self-leveling so that you can take care of it yourself.

Keyboard cleaning slime is the same as the slime kids make at parties. I think it’s made of white glue and borax.

So at least it probably need not be too expensive.

You might be able to mix up 5 gallons or so, dump it on the floor, and sort of roll the slime around with squeegees.

I think 7% would do ok. For 65% I order it. If you do, be careful .. There are some shady companies that ship you a diluted version. A company called lab alley has been reliably consistent. A little more pricey. Otherwise you can find 65% at any hydroponics retailer. It’s used to keep the water flow free of bacteria. This stuff is unbelievably great! It has so many uses. The stronger stuff does work best. If you can get 35% that’s probably equally good if you use 1 cup… 7% I’d use a cup or 2. If you have any clothes with spots etc, you can use the bucket with peroxide on clothes first. It will remove just about any stain you have without harming fabric or color usually. Wet the clothing with the dilution and wash as usual. Stains are gone! Then use dilution for floor. When done, dump dirty water into toilet, it opens drains without harming metal or plastic. It’s also sold as a drain opener. Safe for septic with limited use. I’ve used it for years without damaging anything. Stuff is amazing.

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Just to reinforce the point though, Always Use Gloves. I mean, unless you want chemical burns/bleaching on your hands for awhile. I'll agree it's good stuff, but it's good because it's potent. Handle accordingly.