A hand sanitizer (2) comprises: (a) a first part (14) comprising a chlorite solution and contained in a first dispenser (4) whereby it will be dispensed as a spray or jet of liquid; and (b) a second part (16) comprising an acid solution and contained in a second dispenser (6) whereby it will be dispensed as a second spray or jet of liquid; wherein the chlorite and the acid will react to provide chlorine dioxide when the first part is mixed with the second part; and wherein a mixture (18) of equal quantities of the first part and the second part contains at least 15% alcohol by weight; and wherein at least a part of the alcohol comprises 3-methoxy-3-methylbutan-1 -ol (MMB).
