[Clorox and equivalents]
I seem to recall that the sweet spot for b54red was about
7% Clorox. I do not know how exact his measurements are
when mixing it up. I looked at a jug of Clorox today, it said
"6% sodium hypochlorite". If your sodium hypochlorite product
is 5%, then you would mix it up at (6/5 * 7) %, or 8.4 %
sterilizer in water to duplicate the strength of his Clorox solution.
So, you would mix about .38 liters of baby bottle sterilizer to
a British gallon of water. (Say, a third of a liter or so
of sterilizer in a UK gallon jug, fill up with water, spray.)
(Decent online calculator:
http://www.sciencemadesimple.com/conversions.html
Click on "Volume" for volume conversions.)