M0nica, mee too, I have a range of skin allergies. I don't boil, I use very mild soap pwder.
But another alternative is to soak underwear in Milton/Nappysan and then wash normally. That should get rid of the "thrush" yeasts and some fungi. Bacteria are less affected, but get removed by dilution - the amount of water used in washes/rinses.
Nah, these sprays are a) to panic mothers in particular, that they don't keep their children/houses "clean enough"; b) to sell more and more antibacterial products. the bugs then become resistant to such products, adding to the range of drug-resistant bacteria.