The substances that our company uses do not leave stains, do not have an unpleasant smell and are not toxic.
The substance used by the company will not harm people if they get it on their skin. 
( z1 harm :polarity - :ARG0 ( z2 substance :ARG1-of ( z3 use :ARG0 ( z4 company ) ) ) :ARG1 ( z5 person ) :condition ( z6 get :ARG0 z5 :ARG1 z2 :location ( z7 skin :part-of z5 ) ) )