Hey Mark,

Do you know of any company marketing a free spotter program with "all-natural" or green friendly materials?

Thx,
Mark

I do not. There are websites which sell good quality spray bottles quite cheap. Buy these by the dozen.
Then mix up a batch of any natural spotter. Make it a little stronger than the standard mix for general cleaning. You could then either have labels printed up, or just attach one of your business cards with wide clear tape, such as strapping tape.