Industrial Parts Washers: Spray, Soak or Ultrasonic?

The three kinds

How each parts washer actually cleans

Every parts washer puts cleaning energy on the part somehow. A spray cabinet uses impact, a soak tank uses dissolving, and an ultrasonic tank uses cavitation in a heated bath. Where the energy comes from decides what the machine can reach.

Spray cabinet

A turntable or basket under high-pressure jets of hot aqueous detergent. Line of sight: the jet cleans what it hits. Fast on outer faces and bulk soil, blind on the inside of a bore, a cross-drilling or a thread root.

Solvent soak tank

Parts sit or are brushed in a bath of solvent. Like dissolves like, so fresh oil and grease come off well. Baked carbon, varnish and scale have changed chemically and stay put. Then there is the solvent itself: disposal, fumes and the flammability rules near heat.

Ultrasonic tank

A heated water-based chemistry driven by transducers. Cavitation carries the energy through the liquid, so the inside of a gallery is cleaned at the same strength as the outside. Nothing mechanical touches the surface, and the time, temperature and concentration can be written on a process card.

	Spray cabinet	Solvent soak	Ultrasonic tank
Cleaning action	Impact of hot detergent jets	Dissolving in solvent	Cavitation in heated chemistry
Blind holes, galleries, threads	Only where a jet reaches	Wetted, not scrubbed	Cleaned wherever the liquid goes
Baked carbon, varnish, scale	Partly, with long cycles	Stays on the part	Removed with the matching chemistry
Fresh oil and grease	Good	Good	Good
Bulk mud and heavy debris	Best of the three	Poor	Pre-rinse first
Operator time	Load, run, unload	Hands in the bath	Load, run, unload
Consumable	Aqueous detergent, water, heat	Solvent, filters, disposal	Aqueous chemistry, water, heat
Repeatability	Fixed cycle	Depends on the operator	Time, temperature and concentration set and logged
Fumes and fire	Steam	Solvent vapour; flammability rules apply	Steam; no solvent

The short version.

If the soil is mud and the parts are big and simple, a spray cabinet or a pressure washer is quicker. If the parts have internals that matter, or the soil is baked on, the ultrasonic tank is the one that finishes the job. Many rebuilders run both: spray for the gross clean, ultrasonic for the parts that have to be right. Our six-method comparison goes into the chemistry and the physics.

By the part

Which parts washer for which work

The part and the soil choose the machine. These are the jobs that come through Australian workshops and plants, and the washer that suits each.

Cylinder heads, blocks, housings

Oil galleries, water jackets and blind bolt holes. A spray cabinet cleans the faces; the galleries need immersion. Floor-standing ultrasonic tank, 50 L and up, with an alkaline degreaser. Read the engine block case study.

Carburettors, injectors, small assemblies

Jets and drillings smaller than a pin. Spray and soak do not reach them. A benchtop ultrasonic cleaner at 40 kHz, with a mild chemistry that protects the alloy. Carburettor cleaning.

Machined components with swarf

Chips and cutting fluid before assembly or coating. Spray moves the bulk; ultrasonics clears what clings in the drillings. For volume, a sealed chamber that washes, rinses and dries without handling.

Pistons, manifolds, turbo parts

Baked carbon and varnish. Solvent will not touch it and a spray cabinet needs hours. Heated ultrasonics with a carbon-removal chemistry takes it off in one cycle. Piston ring groove carbon.

Filters, screens, strainers

Pleats and mesh pack soil where a jet cannot follow. Immersion with cavitation clears the element from the inside. Pleated mesh filter elements.

Mud, loader parts, undercarriage

Bulk soil on big simple shapes. A pressure washer or spray cabinet is the right tool; bring the ultrasonic tank in afterwards only for the parts with internals.

The machines

Misonics parts washers, bench to automatic

Every Misonics parts washer is ultrasonic. The range runs from a 9 L bench tank on a 10 A socket to a sealed chamber that sprays, ultrasonically washes, rinses and hot-air dries a rotating basket in one programmed cycle.

Misonics MSX 15 benchtop ultrasonic parts cleaner, lid open

MSX 15 and MSX 30

Benchtop · $4,367 and $6,578 inc GST

Baskets to 490 × 235 mm, heated to 80 °C, from a standard 240 V 10 A socket. The daily bench washer for carburettors, injectors, tooling and small assemblies.

Benchtop machines →

Misonics MSX 70 floor-standing ultrasonic parts cleaner

MSX 50 and MSX 70

Floor-standing · quoted to site

Baskets to 600 × 400 mm with 300 mm working depth, 1,500 W at 25 kHz with load sensing, 240 V 15 A. Heads, housings and batch trays.

Floor-standing machines →

Misonics SonoWash manual immersion ultrasonic tank, front elevation

SonoWash 85 to 220

Manual immersion · dual frequency

Four industrial sizes, to 35 kg a basket, 25/45 kHz in one tank. The same platform as the automated levels, so a process proved here climbs with you.

SonoWash range →

Misonics UltraWash automatic ultrasonic parts washer installed on a production line

UltraWash 70 to 300

Automatic · sealed chamber

Spray wash, rotating ultrasonics, flush, rinse, RO rinse, forced hot-air and vacuum dry in one door. Load, press start, unload assembly-dry.

Automatic parts washers →

Machine	Type	Working volume	Basket	Ultrasonics	Supply	Price
MSX 15	Benchtop ultrasonic	9.4 L	320 × 225 mm · 130 mm deep · 8 kg	300 W, 40 kHz	240 V, 10 A socket	$4,367 inc GST
MSX 30	Benchtop ultrasonic	16.2 L	490 × 235 mm · 140 mm deep · 12 kg	650 W, 25/45 kHz	240 V, 10 A socket	$6,578 inc GST
MSX 50	Floor-standing ultrasonic	45 L	500 × 300 mm · 300 mm deep	1,500 W, 25 kHz	240 V, 15 A socket	Quoted to site
MSX 70	Floor-standing ultrasonic	72 L	600 × 400 mm · 300 mm deep	1,500 W, 25 kHz	240 V, 15 A socket	Quoted to site
SonoWash 85	Manual immersion, dual frequency	60 L (85 L tank)	510 × 330 mm · 25 kg	1,500 W, 25/45 kHz	240 V, own circuit	On application
UltraWash 70	Automatic sealed chamber	70 L chamber	470 × 320 × 160 mm, rotating	1,500 W, 25 kHz	415 V 3-phase	Quoted to site
UltraWash 150	Automatic sealed chamber	150 L chamber	610 × 320 × 200 mm · 100 kg	3,000 W, 25 kHz	415 V 3-phase	Quoted to site
UltraWash 300	Automatic sealed chamber	355 L chamber	620 × 380 × 380 mm, rotating	3,000 W, 25 kHz	415 V 3-phase	Quoted to site

Prices include GST where shown. All specifications and pricing are confirmed in writing at quotation. Parts longer than 600 mm go to the MSX 140 to 240 or the EvoSonic range: see ultrasonic cleaner sizes.

Manual or automatic

When a parts washer should load itself

A manual tank is the lowest capital step and the right one until the labour arithmetic says otherwise. The signs that it is time to climb: an operator standing at the tank for most of a shift, parts handled wet between wash and rinse, and a cleanliness spec that has to be proved batch by batch.

Manual immersion

MSX and SonoWash. The operator loads the basket, sets time and temperature, and lifts it out to rinse and dry. Lowest cost, biggest range of parts, and the process proved here carries straight across to the automatic chamber because the chemistry and frequency are the same.

Automatic sealed chamber

UltraWash. One door, one button. Spray wash, ultrasonics with basket rotation, flush to drain, hot rinse, RO rinse, forced hot-air and vacuum dry, from a stored recipe. Parts come out assembly-dry and the cycle is logged. Built for throughput and for specs that must be repeatable.

Prove it before you buy it

Send the parts and we run them on the machine you are considering, with the chemistry matched to the soil. The recipe that works on the trial is the recipe the machine ships with.

Questions

Choosing a parts washer

Which parts washer is best for a workshop?

For a mechanical workshop the useful pair is a spray cabinet or pressure washer for bulk soil and a heated ultrasonic tank for anything with internals: heads, carburettors, injectors, pumps. If only one machine fits the budget, the ultrasonic tank covers more of the jobs that actually need a machine; the mud can go to the pressure washer outside.

Can an ultrasonic parts washer replace a spray cabinet?

For parts that fit the basket, yes, and it cleans the internals the cabinet never reaches. It is slower than a jet on heavy mud and bulk debris, so a pre-rinse before the tank keeps the chemistry clean. Basket size is the limit: 320 mm on the MSX 15 up to 600 mm on the MSX 70, bigger in the SonoWash and MSX floor range.

Why move away from a solvent parts washer?

Solvent lifts fresh oil and little else. Carbon, varnish and scale stay on the part, and the soil settles back as the part drains. Add solvent purchase, filter changes, disposal paperwork and the fire rules near any heat source. A heated aqueous ultrasonic bath takes off particles and films together and the spent bath is treated as an aqueous waste.

What does an ultrasonic parts washer cost?

The MSX 15 benchtop is $4,367 inc GST and the dual-frequency MSX 30 is $6,578 inc GST, both from a standard power point. Floor-standing MSX, SonoWash and the automatic UltraWash chambers are quoted to site because the tank, basket, heating and services are matched to the parts.

What chemistry goes in a parts washer?

Water-based chemistry matched to the soil. FX Degreaser is the daily bath for oils and workshop soils, MetalTek 100 takes carbon, scale and paint off ferrous parts, and AquaVantage 815 GD is the mild all-metals bath for alloy and mixed loads. The chemical selector matches soil, metal and machine.

What is an automatic parts washer?

A sealed chamber that runs the whole sequence from a recipe: spray wash, ultrasonic wash with the basket rotating, flush to drain, rinse, RO rinse and drying. The operator loads, presses start and unloads dry parts. The Misonics UltraWash comes in 70, 150 and 355 L chambers with six stages in one door.

Industrial parts washers: spray, soak or ultrasonic?