The substances that our company uses do not leave stains, do not have an unpleasant smell and are not toxic.
The substances that the company uses will not emit any unpleasant odors. 
( z1 emit :polarity - :ARG0 ( z2 substance :ARG1-of ( z3 use :ARG0 ( z4 company ) ) ) :ARG1 ( z5 odor :mod ( z6 pleasant :polarity - ) :mod ( z7 any ) ) )