Depends on what you have done to make them see you !
Different commercial works need differing approaches..
High street / small shops - walk in, chat with owner/manager - leave a quality flyer/ brochure.
Care homes, schools, business parks, larger companies - employ a quality telesales person
Councils, multi nationals and the like - you need to find web sites and make contact with the buyer/ facilities manager or equivalent and get registered on an approved suppliers list then go through tender processes, lots of paperwork and time to fill out forms, in depth questions ref. staff, accounts etc ( this is for contracts over 24k )
Darran