Universal Liquid Descaler – 750 ml sulfamic and citric acids • 1:4 dilution • up to six descaling cycles

Universal liquid descaler for limescale

WoldoClean Universal Liquid Descaler helps dissolve mineral deposits in the water circuits of compatible appliances. Scale builds up as water is heated and circulated. The available safety information lists sulfamic and citric acids among the acidic ingredients. This descaler does not remove coffee oils from the brew unit.

Universal describes its potential range of uses, not guaranteed suitability for every material or machine. Check the appliance manufacturer's instructions before using an acidic liquid descaler.

Clear or colour-changing: which descaler should you use?

Both WoldoClean liquids tackle limescale. This universal concentrate has no colour indicator, while the descaler with colour indicator changes colour as its descaling action is exhausted. The available evidence does not establish that either is stronger.

Which appliances can you use it in?

From bean-to-cup machines to capsule and filter models, the important detail is compatibility. Only use an acidic liquid descaler where the appliance manufacturer approves it for that model and its materials.

• Bean-to-cup and manual espresso machines, where acidic descalers are permitted.
• Capsule and filter coffee machines, following their care instructions.
• Compatible kettles, steam ovens, steam cleaners and ironing stations.
• Selected dishwashers, washing machines and limescale-affected surfaces, only where acidic descaling is permitted.

How to use

Mix 125 ml of concentrate with 500 ml of water (1:4) for a standard descaling cycle. One 750 ml bottle gives you six doses. Always follow a different procedure if your coffee machine's manual requires one.

1. Read the descaling instructions for your appliance.
2. Remove any water filter from the tank if the appliance instructions require it.
3. Add 125 ml descaler and 500 ml water to the tank.
4. Run the descaling programme, or follow the appliance's manual procedure if no automatic programme is available.
5. The descaler manufacturer indicates a contact time of around 5–10 minutes; the appliance instructions take precedence.
6. Rinse the water tank thoroughly when the cycle is complete.
7. Run one or two full tanks of clean water through the machine, or follow its designated rinsing programme.

Other appliances may need a different dilution or method. Always check the relevant manual rather than assuming the coffee machine instructions apply.

Descaling isn't the same as cleaning coffee oils

Keeping a coffee machine clean involves dealing with two different types of build-up:

• Liquid descaler removes limescale and mineral deposits from the water circuit.
• Cleaning tablets remove coffee oils and greasy deposits from the brew unit.

For coffee oil build-up in the brew unit, see our phosphate-free coffee machine cleaning tablets. You'll find more maintenance essentials in cleaning products.

How to use clear liquid descaler safely

The concentrate causes skin irritation and serious eye irritation. Wear protective gloves and eye protection when handling it. Avoid contact with skin and eyes, do not inhale mist and never mix it with other cleaning products. Only use it on materials approved for acidic descaling by the appliance manufacturer.

Universal descaler: frequently asked questions

Will it work in every coffee machine?

No. Use it only where the appliance manufacturer allows liquid acidic descaling products.

How many treatments does a 750 ml bottle provide?

At 125 ml concentrate per cycle, the bottle provides six treatments. Follow your appliance's specified amount.

How is it different from the colour-indicator descaler?

This formula has no colour indicator. The alternative changes colour as the descaling action is exhausted.

Does it remove greasy coffee residue?

No. The brew unit needs a separate appliance-approved cleaning product for coffee oils.