I've attached two images of simple magnetic signs we've used in the past. They don't mention carpet as that is a new service but just for your reference.
We are not a "janitorial services" company! (Do not put this statement on the design this is for your information).
We offer clients a free consultation / quote if it fits to include that ("Free Consultation and Quote") somewhere in the design, but not required.
Images/Graphics of "Smiling, happy people" is always a plus but not required.
Some variation of our 'message' (make existing floors healthy/safe/beautiful/easy to clean) (and website) must be included and is more important than the company name (in terms of prominent text).
We are OK with use of icons in place of some text.
Social media icons are not important
The design should feel neutral and work well in both residential and commercial situations.
About our services:
(1.) We use specialized, contained pressure/vacuum equipment for hard surface cleaning and (2.) we apply quality sealers to grout / stone etc.
(3.) We install high-performance / low-maintenance coatings on hard surfaces which make the floor anti-microbial, high-traction (we don't use the term 'non-slip), beautiful glossy shine (no buffing) and easy to clean. (4.)Our carpet cleaning solution is low-moisture and quick drying meaning less risky with no hoses/water lines running all over the place and no loud equipment.
Phone number is (828) GROUT-50 (828-476-8850)
Website is http://www.dirtalerts.com