LOL you might be right,i can never get any semtex either
you can make your own ....
i cant see a good bulk source of liquid peroxide nearby anyway , for adding to the tank or prespray i suppose u mean .
I suppose the hair salon product is in the form it is for reasons of use , handling storage stability . Also its a more than just the peroxide , the liquid mix has wetting agents , peroxide , acids ( as a catalyst i presume ) and other ingredients .... the powder side of the mix seems mostly Ammonium persulfate .
The strongest in the salon places seems to 12% 40vol , i like the paste of spotting , u can water it down a bit also
agriculture might be another source ... this is 30% h2o2 and some acids ... might throw some in the tank and see what happens
http://milkingmachineliners.ie/sorgene-5-5l-e64-99-inc-vat/