Dark, greasy streaks running along a baseboard, around a pipe opening, or at the edge of a wall are rub marks — left by rodents whose fur carries oil and dirt onto surfaces they brush against repeatedly. They appear on routes used night after night, which makes them more informative than droppings: they show you the path, not just the presence.
A simple touch test tells you whether the route is still in use.
This is general information. Identification from a description is never certain. A licensed inspector examining the actual evidence is the reliable answer.
What rub marks are and where they appear
Rodents follow the same routes habitually, keeping close to walls and edges. Their fur transfers oil and grime, and over time it accumulates into a visible smear.
Typical appearance: dark grey or brown streaks, roughly one to two inches above the floor, running along the base of a wall.
Typical locations: baseboards, the underside of pipes, the edges of joists, gaps around plumbing and wiring penetrations, and the corners where two walls meet.
Darker means busier. Heavier staining marks a preferred route rather than an occasional crossing.
The freshness test
Touch the mark.
Fresh marks smear. The oil is still soft, and the mark will be darker and slightly tacky. That indicates a currently active route.
Old marks are dry and hard and do not transfer. They may be historical, from an infestation already resolved.
This single test changes the situation from "there may have been rodents" to "there are rodents using this path now."
What else to look for on the same route
Rub marks rarely appear alone. Following the streak usually finds the rest.
Droppings along the route and near food sources. Mouse droppings are small dark pellets, pointed at one end, roughly rice-grain shaped; rat droppings are larger and more solid.
Gnaw marks at the edges of openings, on baseboard corners, on packaging, on wiring.
An entry point. Follow the streak to where it disappears — a gap around a pipe, a foundation crack, a gap under a door.
Nesting material in undisturbed areas: shredded paper, insulation, fabric.
Sound. Scratching or scurrying overhead or inside walls, most often shortly after dark.
Why this matters beyond the nuisance
Two reasons specific to rodents, and both have consequences beyond cleanliness.
Wiring. Rodents gnaw continuously, and wiring in wall voids and attics is among what they gnaw. This is a genuine fire risk rather than a scare line.
Two Virginia statutes name rodents explicitly, which is unusual — most pest provisions in the code speak generally.
Under § 55.1-1244.1, the tenant repair-and-deduct provision, rodent infestation appears among the example conditions. Under § 55.1-1234.1, covering a dwelling that is uninhabitable at the start of a tenancy, an infestation of rodents is named as a qualifying condition.
So a rodent finding sits on firmer statutory ground than most pest complaints in Virginia.
What to do today
Photograph the marks in place, with something for scale, before cleaning.
Do the touch test and note whether the mark is fresh or dry.
Follow the route and photograph where it leads. The entry point is the thing that has to be fixed; traps address the population, not the access.
Do not clean it up yet. The pattern is what an inspector reads.
Handle droppings carefully. Ventilate the area, avoid sweeping or vacuuming dried droppings into the air, and use gloves. This is standard precaution rather than alarm.
Do not seal the entry point immediately if animals may be inside. Sealing a route with the population indoors creates a different and worse problem.
What this means for you specifically
If you own and live in the home
Exclusion matters more than trapping. Populations replace themselves; a sealed gap does not reopen.
Your action: get an inspection that identifies entry points, not just a trapping service. Ask specifically what will be sealed and how.
If you rent
Rodents are named in the statute, which puts you on stronger ground than most pest complaints.
Under § 55.1-1244.1 you may, after written notice and a 14-day wait, hire a licensed service and deduct the cost — capped at the greater of one month's rent or $1,500. Your duty under § 55.1-1227 is to report promptly.
Your action: notify the landlord in writing today with photographs, and calendar day 14. Repair and deduct →
If you just moved in and found this
There is a short, valuable remedy specific to move-in condition.
Under § 55.1-1234.1, where the unit was uninhabitable at the start of the tenancy — and rodent infestation is named — a tenant may terminate on written notice within seven days of the date possession was to transfer and recover all deposits and rent paid.
Your action: document today and read ending a lease over an infestation. The window is short.
If you are selling
Rodent evidence is not a wood-destroying insect finding and will not appear on the NPMA-33. A home inspector will note it, and buyers react to it strongly.
Your action: address it before listing. Rub marks and droppings are among the most off-putting things a buyer can find, out of proportion to the cost of resolving them.
If you are a landlord
The statutory footing here is firmer than for insects, and the remedies open at 14 days.
Your action: respond in writing, use a licensed operator, and treat exclusion as the deliverable rather than trap counts. More →
Before you call: what costs what
An inspection and a treatment are two separate services with separate prices, and conflating them is the most common way people end up surprised by a bill.
| Typical Virginia range | What it produces | |
|---|---|---|
| Wood-destroying insect inspection and report | $65–$200 | the NPMA-33 form |
| General pest inspection | often free where the company expects to quote treatment | a verbal or written assessment |
| Termite treatment | $500–$2,000; more where damage is extensive | a treatment record |
| Structural repair | quoted by a contractor, frequently the largest of the three | an invoice, not a pest control document |
What is usually free: a quote for treatment, once a company has seen the problem.
What is usually not: the inspection report used in a real estate transaction, and any visit that produces a document rather than a price.
Ask which applies before you book. A company quoting one figure covering both inspection and treatment is not quoting what a sales contract or a lender requires.
Common misunderstandings
"It's just dirt." Rub marks follow a route and reappear after cleaning. Dirt does not.
"One mouse." Rub marks form through repetition. A visible smear indicates sustained traffic.
"Traps will handle it." Traps reduce the population. Only exclusion stops replacement.
"It's an old mark." Possibly — the touch test answers it in seconds.
"Rodents are a cleanliness problem." They are an access problem. Entry points and harbourage matter more than housekeeping.
"Sealing the hole is the first step." Not if animals are currently inside.
What to ask the inspector
- Are these marks active or historical?
- Where are the entry points, and what will you seal?
- Is exclusion included in the price, or only trapping?
- Have you checked the attic and the crawl space for nesting and for wiring damage?
- How many visits does this involve, and what does follow-up cost?
- Mice or rats, and what indicates which?
- Under what name is your Virginia pesticide business license held?
The third question separates a service that solves the problem from one that manages it indefinitely.
What to have ready
Property address and year built, foundation type, where the marks run, whether they are fresh or dry, whether you hear activity and at what time, whether you have found droppings or gnawing, whether food is stored in the area, and whether the building is multifamily.
Frequently asked questions
Mice or rats? Droppings size is the usual quick indicator — mouse droppings are small and rice-shaped, rat droppings noticeably larger. Rub marks alone do not distinguish them reliably.
Why one to two inches above the floor? That is where the animal's back and flanks contact the wall as it moves along the edge.
Can I clean the marks off? Yes, once you have photographed them. Cleaning also tells you something: if they return, the route is active.
Do rodents appear on a wood-destroying insect report? No. The NPMA-33 covers termites, carpenter ants, carpenter bees, and reinfesting wood-boring beetles.
How fast can they reappear after treatment? Quickly, if entry points remain. That is why exclusion rather than trapping determines the outcome.
Verify before you pay anyone
VDACS maintains a public pesticide search at pesticidesearch.vdacs.virginia.gov and publishes an updated list of licensed pesticide businesses weekly. General pest control is category 7a under 2VAC5-685-70.
Ask which name the license is held under — particularly important if the receipt will support a rent deduction. How to check →