Then, I would:

1. Search Google for the following queries: "Dry cleaners near me" or "local dry cleaners" or "dry cleaners [insert city name nearest you]"
2. Search Yelp for local dry cleaners to see which ones had VERIFIED local listings. If they do not have a listing then I can upsell them on submitting their website (if they have one or after I create one for them) to local directories.
3. Search Google Maps on my phone for "dry cleaners" because this is an easy way to walk into a local dry cleaners and strike up a conversation… "So I'm looking for a local dry cleaners, but you don't come up on my Google Maps. Do you know how many customers you could be missing out on because of this?"

I would spend one to two hours inputting all of the data I found from the three tactics above into my soon-to-make-me-money spreadsheet.