Gary
Yes it's a prize draw. The idea is borrowed from JP were you offer a prize and to enter, custys of the shop need to fill in an entry form.
Someone wins a free carpet clean or whatever you put up and you get names. addresses and any info you want that they would think relevant.
Don't get too excited. It's a bit of bother and the ROI is OK but maybe I need to refine it.
Your biggest barrier is why would someone have it in their shop, so share the names.
Everybody wins, because the losers get a 15% off cc voucher.
To be honest I've been more succesful with giving a free clean prize to my local charities. Always get add on work off the winner without asking, committee members use me and I feel good about it.