I've been using Challengers for some 6 or 7 years now, and I'm not aware that I've ever caused damage to any carpet. At least no customer has ever called back after a job and said their carpet "looks funny".
They have written me many notes saying how great their carpet looks after being cleaned with a Challenger.
Re. marketing, when you bought your Challenger package from me a while ago, didn't you receive as part of it my Training Manual? There's a lot in there on marketing to both residential and business
customers. Let me know if you can't find your copy, and I'll send you another one. In the meantime, I know there's a treasure trove of c.c. marketing material at ocibr.com.