What Liquid Should You Use in an Ultrasonic Cleaner?

Clean water is the safest starting point for many household ultrasonic-cleaning tasks. If water alone is not enough, use only a solution approved for the machine and the specific item you are cleaning.

Why clean water comes first

Water carries the vibration through the tank and can help loosen everyday residue. Starting simply also reduces the chance that an unnecessary chemical will damage a coating, gemstone, adhesive or finish.

When a cleaning solution may help

An approved, properly diluted solution may help with oil or stubborn residue on compatible items. The label should clearly state that it is suitable for ultrasonic equipment and for the material being cleaned. Follow its dilution, temperature and disposal instructions exactly.

Liquids to avoid

• Petrol, alcohol-heavy mixtures and other flammable liquids
• Bleach, acetone and strong solvents
• Undiluted acids or alkalis
• Household glass cleaners unless the eyewear maker approves them
• DIY mixtures whose ingredients and concentration are uncertain
• Any product prohibited by the cleaner instructions

Do not assume dishwashing liquid is universal

A drop of mild detergent is often suggested online, but some products contain fragrances, moisturisers, salts or additives that may leave residue or affect an item. Use it only when both the equipment instructions and item-care guidance permit it.

A practical selection checklist

1. Identify every material, stone, coating and adhesive.
2. Read the machine manual and the item’s care instructions.
3. Choose the least aggressive approved option.
4. Measure the dilution rather than guessing.
5. Never mix cleaning chemicals.
6. Rinse and dry only as the item maker recommends.

If you are unsure whether the item belongs in the tank at all, review what not to put in an ultrasonic cleaner.

For compatible household items, see the NudgePickr Ultrasonic Jewellery Cleaner and follow its supplied instructions.