A DC rowhouse wears the year in layers: winter brine and grit at the front door, spring pollen on sills, transoms and radiator tops, summer damp in the English basement. Clean it dry first, then barely damp, with pH-neutral products — and treat plaster, old paint, marble and heart pine as finishes to protect, not grime to scour.
That’s the whole of it. If you’d rather have someone else keep it up, tell us about your place and we’ll send a price for it — nothing is booked until you say so.
Why a rowhouse cleans differently
Our Capitol Hill page sums up the house in one line: “narrow party-wall plans with original plaster, stairs and heart-pine floors that trap spring pollen, hold July humidity long enough for mildew, and take winter salt and slush at a front door a step off the sidewalk.” This guide is for that house and its cousins in Georgetown, Dupont and Logan Circles, Kalorama and Old Town Alexandria.
Read it as a floor plan and the order follows. With one main door a step off the sidewalk, everything the street carries enters at a single point and travels the length of the house: one hall, one stair. The lowest floor starts below the sidewalk, which is where summer shows up first. So the method is about order more than products: dry before wet, top before bottom, the entry first and, on anything old, the gentlest product that works.
Winter: brine at the threshold
What reaches your front step in January isn’t only snow. The District Snow Team, led by the Department of Public Works, lists salt, brine and beet juice among its supplies, and a Snow Team storm advisory encourages property owners to spread salt, pet-friendly deicer or non-clumping kitty litter on their sidewalks before precipitation begins (snow.dc.gov). It all rides in on boots: salt that dries to a white film, and grit that scratches.
Put a coarse mat outside and an absorbent one inside, and sweep the hall the same day. Then wipe the film with plain water or a pH-neutral cleaner, and dry it. Skip vinegar, which is an acid: the National Park Service’s masonry-cleaning guidance warns that acidic cleaners “can be extremely damaging to acid-sensitive stones, such as marble and limestone, resulting in etching and dissolution of these stones.” A marble threshold is that stone; the full list is in the surfaces you should never clean with vinegar.
Spring: pollen on every ledge
Pollen settles wherever a surface faces up: sills, sash rails, the transom ledge over the door, crown molding, the top of every radiator. The National Park Service’s brief on painting historic interiors notes that soiling “may be slightly heavier in the recesses of moldings and on upward-facing horizontal edges,” and an old rowhouse is mostly moldings and edges. Lift it dry first, with microfiber or a soft vacuum brush, then damp-wipe the rest, vent covers and window tracks included: wet pollen smears into a paste.
Radiators need a pass of their own. Dust packs between the columns, and once the heat is on, rising warm air carries fine dust up the wall: the gray shadow above so many old radiators. Brush between the columns and vacuum underneath with the heat off and the iron cool, before the heating season starts. The shadow itself is a paint question, covered below.
Summer: the English basement
The English basement — the garden level set partly below the sidewalk, often with its own door under the front steps — is the coolest floor in the house, so humid summer air gives up its moisture on its walls and floors. EPA’s guide to mold and moisture sets the target: “If possible, keep indoor humidity below 60 percent (ideally between 30 and 50 percent) relative humidity.” Running and draining the dehumidifier is the owner’s half, not a cleaner’s.
The cleaning half is the surface. EPA’s advice — “Scrub mold off hard surfaces with detergent and water, and dry completely” — is routine work in a garden-level bath or closet. Growth in the material is different: plaster or drywall that stays soft or stained, carpet that smells of it, anything wet from an unfixed leak. That’s remediation, and our Terms are explicit: “We reserve the right to refuse or stop service where conditions are unsafe for our team — such as mold, infestation, biohazards, or abusive behavior.”
Plaster and old paint: test before you wash
Plaster is tough; what’s on it may not be. The National Park Service’s brief on painting historic interiors explains that distemper paint — calcimine is another name for it — was the coating of choice on Federal-period decorative plaster partly because it was “readily removable with hot water,” and that water-based paints stayed in use on ceilings through the Victorian years. On a ceiling or cornice that old, a damp sponge can lift paint, not just dust.
So dust old walls dry first, top to bottom, with a soft brush or microfiber, the shadow above the radiator included. Then test a hidden spot with a barely damp cloth; if color comes off, stop, because that surface needs a painter or a conservator. And keep melamine sponges off old paint: they clean by abrasion, which can’t be undone.
Age raises a second question. EPA says a home built before 1978 “is more likely to have lead-based paint,” and that old or worn lead-based paint, “especially on surfaces subject to constant friction like doors or window sills,” can produce chips and dust. Flaking paint is not something to scrub, scrape or sand: EPA’s Renovation, Repair and Painting Rule requires anyone paid to disturb painted surfaces in a pre-1978 home to be certified, and in the District, the Department of Energy and Environment’s lead program (doee.dc.gov/lead) is the place to ask. That’s general information, not legal advice, and disturbing old paint is on no list we publish.
Stairs and old floors
The stair is the hardest-working surface in the house: every trip from the front door to the bedrooms crosses the same treads, so grit that survives the hall gets ground in there first. Vacuum treads and risers before any damp pass, corners included, and wipe the handrail on its own; it collects skin oil the way treads collect grit.
Old floors raise a question first: what finish is on them? Heart pine and wide plank this old may sit under modern polyurethane or under an older wax or shellac finish, which tolerates water far less. If nobody knows, treat it as the delicate one: dry first, barely damp after, dried right away. The rest is in how to clean hardwood floors without damaging the finish: grit off dry, a mop wrung nearly dry, never steam, never vinegar.
A rowhouse year, on a schedule
Our Washington, DC residential cleaning page says Capitol Hill and Georgetown rowhouses carry “original millwork, plaster walls and narrow stairs that reward slow, careful work,” and its FAQ sets the recurring baseline: “Every two weeks is where most households land.” For a stone or floor cleaner you trust, the same FAQ says: “If you would rather we use a specific product or your own vacuum, leave a note on the booking and we follow it.”
The resets are where a rowhouse differs. Our deep clean adds what a standard visit passes by, including “Blinds and window sills detailed” and “Air vent covers and cobweb removal,” and its seasonal-reset card times it “Twice a year, once before guests and once after the season that tracks the most into the house.” Here, that means late winter after the salt, and summer’s end, before the radiators come on and the holiday guests arrive.
The honest boundaries
Some of what an old house needs isn’t cleaning, and we’d rather say so here than at your door.
- Floors. Sanding, screening, refinishing and stripping old wax belong to a flooring contractor; none of it is on any list we publish.
- Paint. Lead testing belongs to a certified lead-based paint inspector or risk assessor; scraping, sanding and repainting, to certified renovators and painters.
- Carpet and upholstery. Shampoo, extraction and deep upholstery cleaning are on none of our home-cleaning lists.
- Outside the door. This guide stays indoors. Washing a historic brick or stone front is preservation work: the National Park Service’s masonry brief warns that cleaning historic masonry without an architectural conservator’s guidance may result in irrevocable damage.
- Equipment. Dehumidifiers, the heating system and bath fans are equipment to service; our deep-clean list reaches the vent covers and stops there.
FAQ
Can I use vinegar on salt film on a marble threshold?
No. Marble is acid-sensitive, and the National Park Service warns that acidic cleaners can etch and dissolve marble and limestone. Lift the grit dry, wipe with plain water or a pH-neutral stone cleaner, and dry it. Rings already etched into the stone are a stone restorer’s work, not a cleaner’s.
Will you take radiator covers off to clean behind them?
Only if they come off freely. The closest published rule is the furniture rule on our deep-clean page: “We clean behind and under anything that moves safely with two people and no tools. Heavy or fragile pieces stay where they are — we would rather leave a spot than damage the piece.” A cover that lifts off can come off; one screwed down stays.
There’s flaking paint on the window trim. Should a cleaning deal with it?
No. In a home built before 1978, EPA says lead-based paint is more likely, so don’t scrub, scrape or sand it. Paid work that disturbs that paint falls under EPA’s Renovation, Repair and Painting Rule, and in the District, DOEE’s lead program is the place to ask. This is general information, not legal advice.