Cleaning is a recurring service, so the first booking is worth a year of visits. Without a site there's no way to book, see prices or trust a stranger with a key.
Clear starting prices, an online booking request and the insured/bonded line customers look for.
Search a city, and MapsProspector lists every cleaning service on the map without a website — scored 1–10, with the phone number, the owner's first name when they sign their review replies, and a pitch written from their own listing.