You usually notice rodents after they have already settled in – scratching in the wall at night, droppings under the sink, gnawed packaging in a cupboard or stock room. When people ask what keep rats and mice away, the honest answer is not one miracle product. It is a combination of denying access, removing food and water, and making the property harder to use as shelter.
That matters because rats and mice are opportunists. In homes, they follow warmth, easy food and quiet harbourage. In commercial settings, they are drawn to waste areas, delivery points, kitchens, plant rooms and storage spaces. If those conditions stay the same, repellents on their own rarely solve the problem for long.
What keep rats and mice away most effectively?
The most effective approach is proofing first, hygiene second and targeted control where needed. People often start with scents, ultrasonic devices or shop-bought bait because they want a quick fix. That is understandable, especially when the problem feels urgent. But if a mouse can still squeeze through a gap under a door, or a rat can still reach food waste behind bins, the attraction remains stronger than the deterrent.
Proofing works because it tackles the reason rodents keep returning. Mice can enter through surprisingly small gaps, while rats exploit damaged drains, broken air bricks, gaps around pipework and worn door thresholds. Blocking those routes is often the difference between a one-off incident and an ongoing infestation.
Hygiene matters just as much. Rodents do not need much to survive. A torn bag of pet food, crumbs behind an appliance, leaking pipework in a void or overflowing external bins can support activity for longer than most people expect. In restaurants, shared bins, grease build-up and cluttered storage create the same issue on a larger scale.
Why food, water and shelter matter more than gimmicks
If you want to know what keep rats and mice away, think in terms of attraction. Rodents stay where basic needs are easy to meet. Remove those, and the property becomes far less appealing.
Food is the obvious draw, but not always in the places people first look. It can be bird seed in a shed, fallen fruit in a garden, dry goods in unsealed containers, or waste tucked into a side alley waiting for collection. In commercial premises, it may be under equipment, in damaged packaging, or in areas staff do not clean thoroughly because access is awkward.
Water is often overlooked. A dripping tap, condensation around pipework, leaking appliances and blocked gutters can all provide enough moisture. Rats in particular are strongly drawn to reliable water sources. In dense urban areas, that is one reason infestations can spread between neighbouring properties.
Shelter is the third factor. Rodents prefer quiet, undisturbed spaces near food and water. Loft insulation, suspended ceilings, cavity walls, understairs cupboards, basements and cluttered storage rooms all offer cover. If you clean thoroughly but leave hidden access points and nesting areas untouched, activity can continue out of sight.
The proofing steps that make the biggest difference
Start outside, because that is where many infestations begin. Check for gaps around pipes and cables, damaged air bricks, cracks in brickwork, broken vents and badly fitting doors. Pay attention to rear access points, bin stores, utility entries and older building features that have worn over time. A small defect can be enough.
Inside, focus on kitchens, bathrooms, utility areas and service risers. Look behind appliances, under sinks and around boxing where pipes disappear into walls or floors. In blocks of flats and commercial buildings, rodents can travel along service routes, so one untreated opening may affect more than one unit.
Materials matter. Soft filler on its own is rarely enough where active gnawing is likely. Proper proofing usually needs durable materials suited to the gap and location. The right repair depends on whether the issue is a door sweep, a vent cover, masonry defect or service entry point. Poor patch jobs often fail quickly.
Storage also needs attention. Keep dry food in sealed containers, raise stock off the floor where possible, and reduce clutter that creates hidden runways. In business settings, organised storage is not just tidier – it makes inspections more effective and signs of activity easier to spot.
Do smells and natural deterrents keep rodents away?
Peppermint oil, strong cleaning products and other smell-based remedies are often suggested, but results are mixed. They may make a small area less appealing for a short time, especially if activity is very light. They do not deal with entry points, nesting sites or food sources, and rodents usually adapt if the conditions still suit them.
The same applies to ultrasonic devices. Some people report temporary improvement, others see no change at all. In busy properties with furniture, partition walls and multiple harbourage areas, sound coverage is limited. For an active infestation, relying on these products alone usually delays proper treatment.
That does not mean every deterrent is useless. It means the role is limited. If a property is already well proofed and clean, a deterrent may support prevention at the margins. It should not be treated as the main answer.
Housekeeping habits that help keep rats and mice away
Good housekeeping is one of the few prevention methods that works in every setting, from a family kitchen to a restaurant back-of-house area. The aim is not perfection. It is consistency.
Clean food debris quickly, especially around cookers, fridges and under units. Do not leave pet food down overnight. Store dry goods in sealed containers rather than thin packets. Empty internal bins regularly and make sure external bins close properly. If you manage a commercial property, review waste storage and collection frequency as part of the control plan rather than treating it as a separate issue.
Outside, keep vegetation from growing tight against the building and avoid letting general rubbish build up near walls or fences. Garden feeding stations for birds can also attract rodents if seed spills and is not cleared. That does not mean you must remove them altogether, but they do need careful management.
When the problem is already active
If you are hearing movement, finding fresh droppings or seeing gnaw marks, prevention on its own is unlikely to be enough. At that stage, the question is not only what keep rats and mice away, but what will remove existing activity safely and thoroughly.
This is where treatment and inspection matter. A technician will usually look beyond the obvious signs and assess extent, entry routes, harbourage and contributing conditions. That is especially important in larger buildings, food businesses, HMOs and managed blocks where rodents may be moving between units or from external defects that are not visible to occupants.
There are trade-offs with any treatment choice. Traps can be highly effective when placed properly, but poor positioning reduces results. Bait can help in some situations, but it must be used responsibly and with regard to safety, non-target risks and follow-up requirements. If drain defects are involved, proofing above ground will not fully solve the issue until the drainage problem is identified.
Speed matters too. Rodent activity can escalate quickly, and delay gives them more time to breed, spread and contaminate areas. For businesses, that can mean complaints, failed inspections and reputational damage. For households, it can mean damage to insulation, wiring and stored belongings, as well as ongoing stress.
Domestic and commercial properties need slightly different strategies
In homes, the focus is usually on kitchens, lofts, understairs spaces, gardens, sheds and gaps around services. In commercial sites, there is often more complexity – loading bays, shared waste areas, suspended ceilings, risers, ducting, false walls and staff practices all play a part.
That is why a one-size-fits-all answer rarely works. A café with rear alley bins will need a different prevention plan from a terraced house with a damaged air brick. A managed block may need coordinated proofing across communal areas, not just treatment in one flat. The principle stays the same, but the execution depends on the building and how it is used.
The best long-term answer
The best long-term answer is to make the property difficult to enter, unrewarding to stay in and quick to inspect. That usually means combining proofing repairs, better storage, better cleaning routines and professional treatment where activity is already established. For many London properties, especially older buildings and busy commercial premises, that joined-up approach is far more reliable than chasing one product after another.
If you have tried sprays, scents or plug-in devices and the signs keep returning, take that as a warning that the source has not been dealt with. Rodent prevention works best when it is practical, physical and consistent. A fast response now is often what prevents a bigger, more expensive problem later.