Household cleaning
Milton Sterilising Fluid dupe
Why pay around £3.25 for Milton? The bulk active is Household thin bleach (sodium hypochlorite ~5%) — 84% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Milton Sterilising Fluid
1 litre · £3.25 typical snapshot
Water and stabilisers
2 · Active
Sodium hypochlorite
2% on the label
7681-52-9NaOCl
Bulk Household thin bleach (sodium hypochlorite ~5%)
3 · Mix
2 parts 5% bleach + 3 parts water ≈ 2% Milton strength
£0.02 per working litre · 84% less than the shelf pack
- Active
- Sodium hypochlorite
- CAS
- 7681-52-9
- Dupe
- Household thin bleach (sodium hypochlorite ~5%)
- Saving
- 84% / L
Saving is per litre of working-strength mix versus a typical pack price, not versus the DIY kit total. Shop prices move — always check the listing.
Label teardown
What the pack promises versus what the label chemistry actually is.
The marketing claim
“Sterilises baby bottles and breastfeeding equipment in 15 minutes”
The chemical reality
Milton is sodium hypochlorite at about 2% — half the strength of thick toilet bleach but the same oxidiser. Dilute 5% thin bleach to 2% and you have the same sterilising chemistry without the pink cap.
Active vs filler
2% Sodium hypochlorite · 98% carrier / filler — Water and stabilisers
- Typical retail
- £3.25
- 1 litre
- Estimated active cost
- £0.20
- Scaled from bulk £2.50 / 5 litres
- Indicative markup
- 16.3×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 1 litre pack of Milton Sterilising Fluid typically retails around £3.25 in household cleaning. That is a UK shelf-price snapshot for the maths on this page — not a live shop quote or a manufacturer RRP. Listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Sterilises baby bottles and breastfeeding equipment in 15 minutes; No rinse required when diluted as directed; and Used by midwives and nurseries.
The catch: Milton is sodium hypochlorite at about 2% — half the strength of thick toilet bleach but the same oxidiser. Dilute 5% thin bleach to 2% and you have the same sterilising chemistry without the pink cap.
- “Sterilises baby bottles and breastfeeding equipment in 15 minutes”
- “No rinse required when diluted as directed”
- “Used by midwives and nurseries”
Proprietary Blend & Dosage Breakdown
The labelled active is Sodium hypochlorite at 2%. Everything else in the pack is water and stabilisers.
At 2% active, most of what you pay for is carrier and packaging. The brand is selling convenience, fragrance and a label — not a uniquely potent molecule.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 5% Household thin bleach (sodium hypochlorite ~5%), mixed to 2 parts 5% bleach + 3 parts water ≈ 2% Milton strength.
- Labelled active
- Sodium hypochlorite
- 2%
- Carrier
- Water and stabilisers
- Retail pack
- 1 litre · £3.25
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Household thin bleach (sodium hypochlorite ~5%) at 5% bulk. Indexed as CAS 7681-52-9, formula NaOCl. Buy it as 5 litres for around £2.50 from Amazon UK.
Working strength: 2 parts 5% bleach + 3 parts water ≈ 2% Milton strength. Indicative cost £0.02 per diluted litre — 84% below a typical branded pack on a per-litre basis, before you reuse leftover bulk.
Follow the mixing method and the supplier SDS. Wear the listed PPE. Do not mix incompatible oxidisers, acids or ammonia.
- Gloves and ventilation. Never mix with acids, vinegar or ammonia.
- Mix 2 litres of 5% thin bleach with 3 litres of cold water to make 5 litres at ~2% — Milton sterilising band.
- Soak clean bottles and teats for the contact time on your chosen guidance (typically 15 minutes).
- Make fresh daily; hypochlorite dies once diluted. Store bulk bleach cool, upright, away from children.
- 5 litres of 5% bleach makes 12.5 litres of 2% sterilising solution.
Dilution recipe
5 L sprayer
Working strength 2 parts 5% bleach + 3 parts water ≈ 2% Milton strength. Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
2,000 millilitres
Household thin bleach (sodium hypochlorite ~5%)
Water
3 litres
Carrier / diluent
40% concentrate · 60% water by working volume (solids are dissolved into the water share).
Required PPE
Loading calculator…
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedMilton | Raw active dupeDupeStack |
|---|---|---|
| Product | Sterilising FluidAmazon UK search — listing, not a confirmed seller | Household thin bleach (sodium hypochlorite ~5%) |
| Pack / unit | 1 litre · £3.25 | 5 litres · £2.50 |
| Active | Sodium hypochlorite at 2%Carrier: Water and stabilisers | 5% bulkNaOCl |
| CAS number | Not disclosed on pack | 7681-52-9 |
| Working strength | Ready-to-use pack | Dilute 2 parts 5% bleach + 3 parts water ≈ 2% Milton strength |
| Cost per litre | £3.25 / L typical pack | £0.02 / L mixed from bulk |
| Headline saving | Baseline | 84% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Ventilation. Use outdoors or with mechanical extraction |
Active ingredient and cheaper alternative — FAQ
Is Milton the same as Domestos?
Same active family (NaOCl, CAS 7681-52-9) but Milton is ~2% for baby-bottle sterilising; Domestos Original is ~4.5% thick bleach for toilets. Never swap strengths without reading the contact time on the label you follow.
Can I use Milton on the patio?
Wrong job. Patio algae is a biocide or acid question — see Wet & Forget or Patio Magic. Milton is for sterilising feeding equipment, not masonry.
How do you mix the Sterilising Fluid dupe stack?
Gloves and ventilation. Never mix with acids, vinegar or ammonia. Mix 2 litres of 5% thin bleach with 3 litres of cold water to make 5 litres at ~2% — Milton sterilising band. Soak clean bottles and teats for the contact time on your chosen guidance (typically 15 minutes). Make fresh daily; hypochlorite dies once diluted. Store bulk bleach cool, upright, away from children. 5 litres of 5% bleach makes 12.5 litres of 2% sterilising solution.
DupeStack provides chemical concentration data and educational mixing guides only. Wellness pages compare food supplements, not medicines or prescribed treatments. Always review the supplier Safety Data Sheet (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Mixing and storage are at your own risk. Some links are affiliate advertisements (Amazon Associates, eBay Partner Network, and Awin when those programmes are live). Commissions do not change listed concentrations or calculator output.
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£8.00Save 84% / L
Indicative DIY stack