Merino base layers, Gore-Tex shells, DWR-treated softshells and compression gear all share a problem: the detergent that cleans them can also destroy them. Enzymes that are wrong for wool attack the fibre. Optical brighteners degrade elastane. Standard surfactants strip water-repellent finishes. And most people own all of these fabrics and one bottle of detergent.
We tested the UK options to find the best detergent for merino and technical fabrics — one product that handles the lot.
What We Tested For
- Merino safety — no felting, no fibre damage, no loss of softness
- DWR and membrane safety — does water still bead after washing?
- Elastane preservation — does compression survive repeat washes?
- Odour removal — technical fabrics still have to come out clean
- Coverage — how many separate products do you actually need?
The Contenders
1. Titan Wash — Best Overall for Mixed Technical Wardrobes
Price: £14.99 / 750g (25 washes) · Cost per wash: 60p (49p on the 3-pack)
Titan Wash was the only option tested that covered every fabric in the category from a single pouch. It's confirmed safe on polyester, nylon, Lycra, elastane, Gore-Tex and DWR-coated fabrics, merino wool, bamboo, Tencel and cotton.
The reason it works across that range is what it leaves out as much as what it contains. There are no optical brighteners, no chlorine bleach and no phosphates — the three things most likely to shorten the life of technical kit. What it does contain is a High Enzyme Complex tuned to sweat proteins, Zinc Ricineolate to bind odour molecules, and oxygenating agents that lift residue without bleaching.
It's fully active from 20°C and recommended at 30°C, which matters more here than anywhere: heat is the primary enemy of merino, membranes and elastane alike. Low-foam powder, added straight to the drum rather than the drawer.
Best for: Anyone whose kit drawer mixes merino, waterproofs and synthetics — hikers, trail runners, winter cyclists, skiers.
2. Outdoor Technical Washes — Best for Reproofing Specifically
The established outdoor washes are strong on membranes and are the right choice when you need to actively restore water repellency rather than just clean. They lack enzyme chemistry, so odour in merino base layers and synthetic tops tends to survive them. Most ranges also require you to buy two or three separate products for wool, down and shells.
Best for: Reproofing a jacket whose DWR has worn out.
3. Dedicated Wool and Delicate Washes — Best for Merino Alone
Wool-specific detergents are gentle and safe on merino, and if merino is all you wash they do the job. They are not formulated for embedded sweat odour in synthetics and offer nothing for DWR fabrics, so they end up as one product among several.
Best for: A wardrobe that is merino and nothing else.
4. Premium Mainstream Detergents — Avoid on Technical Kit
This is the category that causes the damage people blame on the garment. Optical brighteners degrade elastane, standard surfactants strip DWR, and biological formulas not designed for wool can damage merino fibres. If your waterproof stopped beading or your base layer went scratchy, this is usually why.
Best for: Cotton and household laundry.
The Verdict
If you own more than one type of technical fabric, Titan Wash is the efficient answer — one pouch, every fabric, no guessing at the label.
For fabric-specific technique, see our guides to washing merino base layers and washing a Gore-Tex jacket.
Frequently Asked Questions
What detergent is safe for merino wool and Gore-Tex?
Titan Wash is confirmed safe on both, along with polyester, nylon, Lycra, elastane, bamboo, Tencel and cotton. Avoid mainstream detergents containing optical brighteners on either fabric.
Will detergent ruin the waterproofing on my jacket?
Standard detergents can, by leaving residue that stops water beading. A formula without optical brighteners or bleach, washed at 30°C, cleans without stripping the finish. Badly worn DWR may still need a separate reproofer.
Can I wash merino and synthetics in the same load?
Yes, at 30°C on a gentle cycle with a detergent rated for both. Keep the spin low and air dry.
Do I need a special wool detergent as well?
Not if your detergent is already rated safe for merino. A second product is only worth it if you wash a lot of non-merino wool knitwear.
One Pouch, Every Fabric
Stop buying three detergents. Shop Titan Wash from £14.99, or test it on your most expensive item with the £2.95 sample.