眼镜店超声波清洗机：首饰店、钟表店也适用的柜台免费清洗服务

A customer brings in glasses to have a screw tightened, or a ring to be polished: each visit is a chance for the shop to see them again. An ultrasonic cleaner for optical shops and jewellery stores, placed right at the counter with an offer of free cleaning, is a simple way to create more of those visits. This guide is for opticians, gold and silver jewellers and watch shops.

Why does in-store cleaning keep customers coming back?

• Customers get a reason to return: glasses worn every day collect skin oil and dust; rings collect soap and hand cream. In Vietnam, plenty of people start wearing glasses young: VnExpress (August 2024) reported a Ho Chi Minh City Center for Disease Control study of 1,230 pupils at 8 schools that found 54% had refractive errors, up from just over 27% in the 2019–2020 school year. VnExpress – Vietnamese source
• Cleaning time is inspection time: Jewelers Mutual, a US jewellery insurer, recommends professional inspections and cleanings twice a year. The jeweller checks for bent, broken or worn prongs and loose, cracked or chipped settings or stones; only a piece that passes is cleaned. Jewelers Mutual
• For optical shops: while cleaning, staff easily spot yellowed nose pads, loose screws or scratched lenses, and can suggest new pads, a frame adjustment or an eye test.

There is no general figure for how much this service lifts sales; results depend on how the shop advises customers.

The in-store cleaning routine in a few minutes

1. Place the machine at the counter and offer free cleaning: choose a spot customers can see, near a power socket and away from the edge of the counter and the cash area.
2. Run a cycle of a few minutes, then dry: check the item first, fill with clean water and a few drops of mild soap, and choose 3 minutes for light dirt or 5–10 minutes for heavier soiling. Rinse and dry with a soft clean cloth.
3. Advise the customer while they wait: ask what they usually wipe their glasses with, check ring prongs and mention when to come back for the next clean.
4. Introduce a mini cleaner to take home: a customer who has just seen their item come out cleaner understands the benefit immediately, so let them hold the machine.

Ultrasonic cleaners for optical and jewellery shops: what should stay out?

• Porous or treated stones: Jewelers Mutual's guidance for retailers says opals, emeralds, pearls and turquoise can crack or discolour under intense vibration; pieces with loose stones or worn prongs must be set aside, and the tank should not be overloaded. Jewelers Mutual – for stores
• Antique or oxidised pieces: GIA (Gemological Institute of America) recommends gentle cleaning with warm soapy water rather than an ultrasonic. GIA The full list is in our article on mini ultrasonic cleaners.
• Lenses with scratched or peeling coatings: lens makers have no single agreed guideline, so check with the manufacturer first or clean by hand. For correct lens wiping, see our article on cleaning glasses.
• Watches: never immerse the watch head; clean only a metal bracelet removed from the case, unless the brand permits otherwise.

Counter rule: if in doubt, don't clean it, and always ask the customer first.

Where does ultrasound help, and where is a cloth still needed?

On glasses, an ultrasonic cleaner is most useful for nose pads, hinges and the gap between lens and frame. Lenses still need proper wiping:

• Sultana Lupin et al. (2025, BMC Research Notes) tested six common ways of cleaning glasses, from cotton and microfibre cloths and soapy water to wipes with and without alcohol. All significantly reduced ATP, a marker of organic soiling, with median reductions of roughly 75–93%; alcohol-free wipes scored highest. Ultrasonic cleaning was not tested, the sample was small and one person did all the cleaning. The authors suggest ATP testing can be done outside a lab, including in optician shops. PMC
• ZEISS notes that shirt sleeves, ties and handkerchiefs are not really suitable for cleaning lenses; rubbing with rough materials can cause light damage, especially to coated plastic lenses. ZEISS

After every cycle, wipe the lenses with a clean microfibre cloth in front of the customer.

Selling mini cleaners for home use

• Describe the use honestly: the machine cleans the small gaps of frames, plain rings and metal watch bracelets; it does not replace bringing valuable pieces in for inspection.
• Instructions at handover: add water before switching on, keep items fully submerged, don't look directly at the UV light, and check the list of items not to clean.
• Gifts with the shop's name: a jeweller wanting to give a cleaner with wedding rings can order logo printing on the packaging, Inmax's entry customisation level, with a minimum of 300 units and delivery in 7 to 10 days.

Inmax ultrasonic cleaners for the counter and for customers

• U27: a 200 ml tank vibrating at 48 kHz, plus a UVC light at 270–280 nm; the countdown display sits on the black top panel, 22 W. Cycles of 3, 5 or 10 minutes (ultrasound + UV) and 5 minutes of UV only. Customers can see the time remaining, which suits counter use.
• U13: a cylindrical body 108 mm across with a silver-plated lid, also 48 kHz, weighing only 298 g at 20 W; indicator lights for the 3/5/10-minute cycles and UV are on the front. Compact, so it suits take-home sales or gifts.

The UVC light is an extra step that does not replace washing and is not sterilisation. See the ultrasonic cleaning range or the comparison page.

Importing ultrasonic cleaners for optical shops from Inmax

When you are just testing the service, the Starter tier (from 10 units, 15% off the listed retail price) is a sensible starting point. As quarterly volume reaches 50, 200 or 500 units, the discount rises to 22%, 28% and 35%.

• No deposit on the first order, and a single carton is still charged at dealer price.
• Goods leave the Hanoi or Ho Chi Minh City warehouse within 48 hours for orders confirmed the same day.
• Buyers call the Inmax hotline directly for warranty (24 months, with replacement in the first 30 days); the shop does not handle repairs.
• Each model comes with white-background photos, lifestyle photos and vertical videos ready for the shop's fanpage.

Inmax requires partners to have an active sales channel and to keep to the listed price.

Frequently asked questions

Does free cleaning cost much?

Mostly water, soap and staff time. The U27 draws 22 W, so a 5-minute cycle uses less than 2 Wh of electricity.

What if a customer's item is damaged?

Prevent it from the start: check prongs, ask about the stone and only clean when you are sure. If you cannot tell whether a stone has been treated, clean it by hand.

Should the counter use the U27 or the U13?

The U27 has a countdown display, which suits a service counter; the U13 is smaller and lighter, which suits take-home sales.

Want to trial the counter service before ordering more? Check the terms on our dealer policy page, or message us through the contact page to ask how many U27 and U13 units come in a carton.