Parts washer: solvent-based or aqueous cleaner—which should you choose?

In an auto repair shop or industrial maintenance workshop, choosing a product for a parts cleaning tank depends on the contaminants to be removed, the materials the parts are made from, and production requirements. Petroleum-based solvent or aqueous degreaser: each technology meets specific needs.

Beyond the purchase price, it is essential to compare cleaning effectiveness, solution service life, part drying, VOC-related risks, and waste disposal costs.

Solvent or aqueous degreaser: what are the differences for industrial degreasing?

Above all, the degreaser you choose must be compatible with your parts washer’s technology. Equipment designed for solvents and equipment intended for aqueous solutions are not necessarily interchangeable.

Petroleum-based solvent for stubborn contaminants

Hydrocarbon-based solvents are particularly effective at dissolving thick grease, undiluted oils, tar, and other hard-to-remove deposits.

ARCAMECA 250 is a cold-use degreaser based on dearomatized hydrocarbons, suitable for solvent-based parts cleaning tanks. It cleans mechanical parts, dries quickly, and leaves no greasy residue.

This option is particularly suitable for auto repair shops, repair workshops, and maintenance teams working on heavily soiled parts.

Aqueous cleaner for regular parts cleaning

Aqueous degreasers use cleaning agents in a water-based solution to remove oils and grease. They are particularly useful for workshops that frequently clean parts made from different materials.

ARCAMECA L821 is a concentrated, low-foaming alkaline detergent compatible with many metals, including steel, stainless steel, aluminum, and copper alloys. It is particularly effective on oils, heavy grease, and carbon deposits, and is suitable for cleaning in enclosed spray washers, immersion tanks, or ultrasonic baths.

Use it at a concentration of 0.5 to 2.5% on light alloys and 0.5 to 5% on steel and stainless steel. For optimal effectiveness, a temperature above 50 °C is recommended, in accordance with the manufacturer’s instructions

Which degreaser should you choose for the contaminants present?

Price per liter alone is not enough to compare solutions. A ready-to-use solvent and a concentrated cleaning solution do not have the same startup cost.

For a meaningful comparison, consider the cost of preparing the cleaning solution, as well as how long it lasts, product losses, and waste disposal costs.

Good to know: the choice of degreaser also depends on compatibility with the parts cleaning tank, the materials the parts are made from, and the conditions of use. A tank designed for solvents must not be filled with an aqueous detergent, or vice versa, without approval from the equipment manufacturer.

Cleaning solution service life: the real key to savings

A product that costs less upfront is not necessarily the most economical to use. Bath life depends on the amount of contamination introduced, drag-out losses, and filtration or oil-removal operations.

To manage cleaning costs, it is useful to track the number of parts processed between bath changes and the amount of product added during that period.

VOCs, safety, and regulations: what precautions should workshops take?

When choosing a degreaser, consider its classification, flash point, VOC emissions, and operator exposure conditions.

A solvent with a high flash point may still require precautions for ventilation, storage, and handling. Requirements vary according to its composition and the cleaning process used.

Check parts cleaning tank compatibility: never replace an aqueous degreaser with a solvent without approval from the equipment manufacturer.

Before switching products, consult the safety data sheet (SDS) and check pump and seal compatibility, ventilation needs, personal protective equipment, and, if necessary, ATEX requirements.

Used baths must also be characterized and sent to an appropriate treatment facility. When they are classified as hazardous waste, applicable tracking requirements must be met.

Can solvent from a parts washer be recycled?

For workshops that regularly use large quantities of solvents, recycling by distillation can offer economic and operational benefits.

The process separates a recoverable portion of the solvent from accumulated oils, greases, and other contaminants. The regenerated solvent can then be reused if its quality and the process allow it.

REGESOLV recycling units are designed for industrial solvent recovery. Equipment selection depends in particular on the volume processed, bath composition, distillation temperature, and required safety features.

Good to know: the cost-effectiveness of a recycling unit depends on the volume of solvent used, the actual recovery rate, waste costs, and the energy required. A feasibility assessment is essential, especially for complex mixtures or high-boiling-point solvents.

Drying parts: why your choice of degreaser matters

Drying time can directly affect shop productivity, particularly when parts must be reinstalled, painted, or assembled quickly.

Product type	Drying	Precaution
Petroleum-based solvent	Often dries quickly through evaporation	Control vapors and associated risks
Aqueous cleaner	Rinsing and drying sometimes required	Avoid residual moisture and corrosion

Which parts washer cleaning product should you choose for your business?

To make the right choice, consider the contaminants involved, the materials, the required level of cleanliness, and the type of equipment available.

To choose equipment suited to your parts and process, explore our range of professional parts washers.