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Ideally borderline illegal, with horrific consequences for the environment should it be not disposed of correctly, something that leaves the tiles and grout with an uncanny valley like cleanliness, possibly it dissolves me as I use it. But still available in shops/online or easy to make.

Context the communal rubbish area and staircase on my floor of the tower block is awful, sticky underfoot and probably more dangerous than London air. SO I have a mop, I just need the secret formula to spread across it. Bonus if it somehow coats the floor with an impenetrable film.

Suggestions?

I suspect you’ll want something scrubby, to help break up the goo on the floor? Or something scrappy to force it up and off, leaving you just to clean off the residue.

I’d be very, very wary of combining cleaners in a communal area. All sorts of Unfortunate and Liability could follow.

Considering I have repaired the lift door (it wasn't closing), two of the fire doors (one was missing glass the other was coming off the hinges), power washed the drainage systems in the walkways clear, I am confident no one in the council has a clue about anything, and no one is around at 0100 when I tend to venture out tools in hand.

Do you try sprinkle dirt with ol' good soda(layer 2-4 mm) and spray vinegar acid/vinegar over it? Chemical reaction gives a burst of foam and then disappear. You only need to mope a remnants. It's stink a bit but way less then any cleaner

Self-repair of fire doors is also a route to criminal liability in the UK. If you have done stuff already, make sure you have lots of evidence of trying to get the responsible/accountable person involved and therefore you took action due to the neglect of others. Also, ideally, don’t touch them yourself.

The Building Safety Act 2022 and the Regulatory Reform Order 2005 require adequate maintenance of residential buildings in London. start quoting them at your landlord and if nothing comes back, complain to the council under the housing health and safety rating system (england) regulations 2005 or raise a complaint to the Building Safety Regulator.