Brake cleaner and contact cleaner sit side by side on the shelf in many workshops, and both dissolve oil and grease. The difference between brake cleaner and contact cleaner, however, lies in the composition, the material compatibility and the intended use. Anyone using the wrong cleaner on plastic housings, connectors or painted surfaces risks damage that costs more than the can. This guide classifies the cleaner groups and sets out the rules for safe use.

Brake cleaner: powerful degreasing of mechanical parts

A brake cleaner is a cleaner with a high solvent content for mechanical components. It was developed for brakes, where brake dust, oil, grease and brake fluid have to be removed from discs, drums, callipers and pads without leaving residues. The cleaner evaporates completely, and that is precisely its strength: after cleaning, a dry, grease-free metal surface remains.

Typical areas of use:

Brake discs, brake callipers and brake pads before fitting
Clutch parts, gearbox housings, engine blocks
Tools, bearing seats, threads before applying thread locker
Metal parts before painting or bonding
Removal of lubricating grease and preservatives

The brake cleaner from the Aerosols Germany range is intended as a universal cleaner for parts contaminated with oil, grease and brake dust. According to the product description, it contains acetone and is therefore not suitable for painted surfaces. Carbon dioxide is used as the propellant. The brake cleaner with lemon variant has a lemon scent.

Contact cleaner: gentle on materials for electrics and electronics

A contact cleaner is designed for electrical contacts, connectors, switches, relays and circuit boards. The requirements differ from those at the brake: the cleaner must dissolve oxide layers, grease and oil residues, dust and resinous deposits, but must not attack plastic housings, insulation, labelling or potting compounds. For this reason, solvents are chosen that are compatible with common plastics.

Typical areas of use:

Connectors and terminal strips in automotive electrics
Switches, push buttons, potentiometers and relays
Circuit boards and conductor tracks after soldering or during fault finding
Contacts in control systems, control cabinets and household appliances

According to the product description, the contact cleaner from the range cleans contacts and connectors in automotive electrics and in electronic components, removes oil and grease residues and is compatible with common plastics. It reduces the voltage drop at contaminated contacts.

Contact cleaner is not the same as contact spray

The two terms are often confused. A contact cleaner cleans and evaporates. A contact spray leaves a thin protective film that displaces moisture, prevents oxidation and lowers the contact resistance. In practice, the contact cleaner is used first, followed by the contact spray if required. On contacts that must remain dry, for instance on high-voltage parts or optical sensors, a protective film is undesirable.

The difference at a glance

Feature	Brake cleaner	Contact cleaner
Main task	Remove oil, grease, brake dust from metal parts	Clean contacts and electronics
Cleaning power	High, strongly dissolving	Targeted, matched to contamination on contacts
Painted surfaces	Unsuitable with acetone-based formulations	Generally compatible, preliminary test recommended
Plastics	Can soften or cloud sensitive plastics	Compatible with common plastics
Residues	Evaporates completely	Evaporates, leaves no protective film
Typical location	Chassis, drivetrain, workbench	Wiring loom, control unit, control cabinet

Material compatibility: where it becomes critical

Paints

Acetone-based cleaners soften many paints. On body parts, painted wheel rims or machine housings, this can lead to dulling, swelling or detachment of the paint layer. For cleaning painted surfaces, milder cleaners such as an industrial cleaner, an assembly cleaner or a foam cleaner are suitable. If a painted surface is to be degreased before repainting, a preliminary test on a concealed area is essential.

Plastics and rubber

Plastics react differently to solvents. Polystyrene, ABS, polycarbonate and acrylic glass are softened by strong solvents, resulting in stress cracks or clouding. Polyolefins such as PE and PP are usually insensitive. Rubber seals can swell or become brittle. The rule is therefore: brake cleaner only on metal, and on plastics and rubber only cleaners that are intended for this according to the label.

Electronics

On circuit boards and inside devices, it is not only the solvent that matters but also evaporation and freedom from residues. A cleaner that leaves residues can promote leakage currents. The device is de-energised before cleaning. Components such as displays, membrane keypads, loudspeaker diaphragms and sensors are not intended for spray cleaners. When in doubt, the contact cleaner is the gentler choice.

Degreasers and industrial cleaners: the third group

Between brake cleaner and contact cleaner lies the group of degreasers and industrial cleaners. They are intended for general cleaning in workshops and production when the cleaning power of a brake cleaner is not needed or material compatibility is more important. The range offers the degreaser as an intensive cleaner, the industrial rapid cleaner and the assembly cleaner with lemon as an all-purpose cleaner. Anyone who regularly prepares parts for bonding, sealing or painting thus has a cleaner to hand that is no more aggressive than necessary.

The right choice in three questions

What is to be cleaned? Metal mechanics: brake cleaner. Electrics and electronics: contact cleaner. Mixed surfaces in assembly: degreaser or industrial cleaner.
What is nearby? Paint, plastic, rubber or labelling within spraying range argue against acetone-based cleaners.
What happens next? If a protective film is to remain, contact spray or maintenance spray follows. If bonding or painting is planned, the surface must be completely dry and free of residues.

Safety notes for all cleaners

The cleaners in these groups contain flammable solvents and are pressurised as aerosols. Regardless of the product, these rules apply:

Work only in well-ventilated areas and do not inhale vapours.
Keep away from ignition sources: no open flames, no smoking, no sparks from grinding or welding nearby.
De-energise electrical equipment before cleaning and switch it back on only after complete evaporation.
Protect containers from sunlight and heat, do not pierce, do not throw into fire.
Wear safety goggles and suitable gloves; solvents also degrease the skin.
The information on the label and safety data sheet of the respective product is authoritative.

Cleaners for workshops, industry and own brands

Aerosols Germany supplies brake cleaner, contact cleaner, degreaser and industrial cleaners, produced in Europe and quality-checked in Iserlohn, for vehicle workshops, industry and trade. On request, you can obtain the products under your own label, with variants tailored to your range.

Are you looking for a cleaner with defined material compatibility or would you like to offer a cleaner line under your own brand? Then send your enquiry to Aerosols Germany and we will advise you on the right formulation.

Brake cleaner and contact cleaner: the difference