The substances that our company uses do not leave stains, do not have an unpleasant smell and are not toxic.
The stain-free substances used by the company are non-toxic.
( z1 toxic :polarity - :domain ( z2 substance :ARG1-of ( z3 use :ARG0 ( z4 company ) ) :ARG1-of ( z5 free :ARG2 ( z6 stain ) ) ) )