Make sure your business has prominent branding before your worry about your advertising campaign. A name and a slogan that sticks, an "image", and so forth. Have you thought about bus bench advertising? How about direct mail? Leave a business card anywhere, join some associations. I'd also find a way to incorporate scraping into another business say electronics recycling in partnership with schools and non profit orgs as a fund raising method. Now you can setup marketing tables at any local community events like earth days, green expos, farmers markets, or whatever it is to get your name out there. Find landlord networks or associations, realtors and property managers and offer clean out services, just other extensions of the business to get your name out there and foot in the doors.