Sales question(Honda)

Would leaving business cards on peoples door window who drive Honda’s be a good idea ? I’ve been selling Honda’s for a few years now but the past couple months have been pretty slow, still hitting my numbers and getting my return customers but always wondered if this would be an option or if im violating any rules. And yes I know at best the return would be MAYBE 1 out of 50 actually call me, but it’s very minimal work on my end