Its strange. I had spotter bottles made, from Cleansmart i believe. They looked great, nice sticker sprayhead phone numbers on etc.
I must have left 200 over 2 years and only ever heard back from 3 - 4 people because of it.
One lady left it unused on the stairs as she was leaving the country. One man has used me a good few times because of it, and a few weeks ago a couple had a couple more bottles and then wanted some carpets done.
But I would have thought that more people would have called back, but it didnt really work out. Strange and a shame.