I wouldn't expect minerals to appear suddenly as a thick film.
By the way, where did you hear the suggestion to use Dawn detergent as part of a soil flush solution? That's a new one to me.
I understand adding a little Hydrogen Peroxide ... diluted ... like 1-3 ounces of drugstore peroxide per quart of water.
>> I mean I watered with hydrogen peroxide and dawn in a big containner of water about 6 pm and then by 230 pm the next day.. pots that never had issues it was everywhere and then that mushroom popped up too..
One totally unsupported guess occurred to me as a possible answer to 'why so sudden?" Just a guess:
Maybe dunking the pots in Dawn and peroxide did kill a bunch of soil organisms ... but it killed the ones that were keeping the mushrooms and "whatever" in check.
Once some of the microbes were killed, maybe the nasty fungus and mushrooms had no competition and took over suddenly.
That is just a wild guess.
