Well, I called the company that sells borax, as they only sell it to businesses. It turns out borax is not widely available in the UK because it is relisted as "reprotoxic category 2".
They gave me the link to european chemical agency:
https://echa.europa.eu/substance-information/-/substanceinfo/100.129.152Very nice. I've been cleaning with borax for days, I have inhaled it so much, often washed stuff with my bare hands. I was just planning to steam clean the floors in the entire house with this, and was ecstatic about
this possibility.
They suggested 'Borax substitute' that is sold on the UK market but I have no clue whether this would kill mold spores
https://www.google.com/search?client=firefox-b-d&channel=crow&q=borax+substituteI guess there's no way in the universe to get rid of mold and its spores, is there, sorry about
the exaggeration.