Can a certified eco brand stand up to one of the UK’s biggest household names? We compare power, price, transparency and sustainability — and crown a clear winner.
When it comes to cleaning glass, most people want streak-free shine, zero effort, and a bottle that doesn’t break the bank. But what happens when you swap your supermarket go-to for a greener alternative?
In this head-to-head review, we put Delphis Eco Glass Cleaner up against Flash Sparkling Glass Spray — two UK-based sprays with very different approaches. One leans on performance and low price. The other promises planet-friendly cleaning without compromise. So, which one actually delivers?
Flash Sparkling Glass Spray
✅ Best for: Top-tier performance at low cost
- ✨ Cleaning Power: 4.4 / 5
- 💷 Cost: £2.49 (800ml) – 31p per 100ml
- 🫧 User Experience: High-shine streak resistance
- ⭐ Customer Feedback: One of the most praised supermarket sprays
- ♻️ Eco Rating: 0.4 / 5
- ★ Overall Rating: ⭐⭐⭐⭐ (4.3 / 5)
Delphis Eco Glass Cleaner
✅ Best for: Green credentials + pro results
- ✨ Cleaning Power: 4.2 / 5
- 💷 Cost: £4.12 (700ml) – 59p per 100ml
- 🫧 User Experience: Smear-free, mild scent
- ⭐ Customer Feedback: Good from refillers and bulk users
- ♻️ Eco Rating: 4.9 / 5
- ★ Overall Rating: ⭐⭐⭐⭐ (4.2 / 5)
Verdict: Performance vs Priorities
Both products get the job done — and done well. Flash continues to dominate in raw cleaning power and price, costing just 31p per 100ml, and delivering near-instant results with minimal effort. It’s powerful, convenient, and widely available.
But Delphis Eco has closed the gap in a meaningful way. With refill options bringing its long-term cost down to 50p per 100ml, it’s no longer just a “premium eco” option — it’s a realistic alternative for households looking to cut plastic waste and reduce environmental impact. Its cleaning performance is only slightly behind, and the refillable design makes it easy to slot into daily routines.
That said, for everyday shoppers on a tight budget, the price gap — however reduced — still matters. While eco innovation is moving in the right direction, accessibility remains the final hurdle.
Bottom line:
If cost is your main concern, Flash wins. But if you’re seeking a greener routine without sacrificing too much performance, Delphis Eco proves you can clean sustainably and affordably.
❓ Frequently Asked Questions
Q1: Is Delphis Eco worth the higher price?
Yes — especially if you’re committed to reducing plastic waste. While the upfront price is higher, subscribing to refills or reusing containers can bring long-term costs down. Plus, you’re supporting a UK brand focused on sustainability.
Q2: Will I notice a big difference in cleaning power?
Not significantly. Flash is slightly stronger on first pass, especially for grease or heavy marks, but Delphis Eco performs reliably for daily cleaning and leaves a streak-free finish on glass and mirrors.
⚠️ Disclaimer
All product scores and comparisons are based on independent testing and publicly available information. Prices reflect typical retail costs as of 2025 and may vary by store or region. This post is for informational purposes only and does not constitute product endorsement.
Consumers Lens 