This is from an article or post by: Robert M. Hinderliter.
I think the title was Hints for Low-Buck Advertising,
it was included in Selling Pressure Washing By Larry Hinckley
I am not sure where I got it, believe on the dcs1 (Delco) site.
Yellow Pages:
Never have an advertisement larger than an in-line business card or smaller than a regular listing. When there is less than one page of advertising an inline business card advertisement will get more leads than 1/4 page advertisement. I tested this for one year. The inline business card advertisement produced more than the 1/4 page advertisement.
Always have at least a regular listing so that you can be found in the yellow pages by your customers. And do not waste your money on off brand yellow pages.
Yellow Page Advertising
1. Automobile Detail & Clean Up Service
2. Automobile Washing & Polishing
3. Building Cleaning-Exterior
4. Ventilating Systems Cleaning
5. Cleaning Roof, Patio, Sidewalks, etc.
6. Cleaning Service-Pressure, Chemicals, etc.
7. House Washing
8. Roof Cleaning
9. Steam Cleaning Automotive
10. Steam Cleaning Industrial
11. Truck Washing & Cleaning
12. Water Pressure Cleaning
13. Water-proofing
14. Pipe Cleaning
15. Building Restoration & Preservation
16. Washers Pressure
17. Pressure Washing Equipment and Services