Phil
When you say (according to Dry Fusion it's safe on all carpet's) are you referring cleaning agent or machine? Woolsafe don’t/wont endorse any machines if that help
, have also seen the same prior to cleaning did it have some type plastic runner (looks like it did)
I’m with Shaun (and then review your cleaning procedure)
I actually like the system on commercial.
Jim
ServiceMaster
and agree DF dose seem to be a bit fast