Very tough to try and go after large companies with something like this. Ideally, you hope they come to you, which puts you in a better negotiation position. As a quick flip, you could try emailing some of the cleaning companies and services using variants of the name and see if you can get some offers going that way. If you get multiple offers, you can move it to auction someplace like Sedo or even eBay and hope it gets bid up. Unless you just get lucky and a company is on the verge of launching some "clean with green" marketing push, the big guys aren't even going to respond.