Pressure washing of rubber gym floor mats?

Do you recommend I pressure wash them, and if so, should I use soap or any
kind of cleaning solution? Or should I soft wash? If they smell, I’m going
to use solution that includes bleach. But that’s good advice to do one as a
trial before. I’ll do it on the underside of the mat. I’m doing the guy’s
house soon so I’ll just see to it that he has a mat there for me to try
cleaning. I’m one way or the other seeing this being around $400. There is
a LOT of area to be cleaned. I have yet to measure one mat and see how much
footage that’s going to be going by how many there are.
J