While Henry is mostly correct, I might interject a little common-sense as well. Find a local pressure washer sales and service center (not Lowes!). Usually, they can help you determine what your area needs are for chemicals. If your just starting out ...K.I.S.S is the rule. I operate outside the confines of conventional business practices. You must learn from both perspectives and arrive at your own direction of operating a pressure washing business! I'll give you 3 secrets: Word of Mouth advertising, DO NOT affix permanent signage on your vehicles or trailers! Your name is the name of your business. If you want more...let me know.