I think it's due to walking in from the garage where the golf cart is right near the door into the house, and here we don't have a mud room like we had and walked thru on rugs in bigger houses before. We take our shoes off at the door, but we have the dust/dirt mentioned, too.
Having your furnace/AC air ductwork professionally cleaned out is an eye opener for sure, in ANY house regardless of how clean it is kept by cleaning people and owners. There are contaminants, building construction dust/dirt, carpet fibers, human hairs, pet hairs, dirt/dust, and all kinds of stuff in there you didn't know about.
Air duct cleaning has to be done by companies specialized and equipped to do that, because
there can be blowback etc if mistakes are made, and it has to be done under strict guidelines. Not every HVAC company will do it, because it's expensive to get and use the equipment, and it's heavily regulated by the EPA(I think that's what contractors told me) and health laws.
This web pages explains it, and a good "quick start" video there is the 4th one down the page.
See:
Videos | NADCA
Once you've had this done, you'll be amazed at what is in the air ducts of a "stereo-clean" looking home. It's pretty disgusting, and it affects cleanliness of the home. We had a veteran cleaning lady who always suggested that her homeowners get the air ducts cleaned, so that the house was
truly clean inside, and then the house stayed cleaner between bi-weekly or weekly cleanings. We did it and she was right.
**Also: I use a wet Swiffer to spruce up our laminate areas,
but I use that only after vacuuming. There is no substitute for
suction of a vacuum cleaner, which Swiffers and steam mops don't have. They are nice, but really,
they rub the dirt around and pick up "some" of it. Vacuum first. Shark makes an awesome cordless stick vac with strong beater bar.