Part of some hand soaps (5)
I believe the answer is:
boron
(Other definitions for boron that I've seen before include "component of steel" , "Metalloid element, B" , "Non-metallic element, symbol B" , "Atomic no 5" , "element needed for steel" .)
I believe the answer is:
boron
(Other definitions for boron that I've seen before include "component of steel" , "Metalloid element, B" , "Non-metallic element, symbol B" , "Atomic no 5" , "element needed for steel" .)