Laundry detergent deals in Switzerland: how the promo cycle works

You should almost never pay the full shelf price for brand laundry detergent in Switzerland. Consumer magazine K-Tipp found that big-pack brand detergent is sold almost exclusively through promotions, often advertised at around 50 percent off. Learn the recurring promo windows, compare the price per wash and buy two to three promo cycles ahead.

Sources checked regularly: K-Tipp's investigation into brand detergent promotions and the K-Tipp promotion calendar (reported by 20 Minuten, January 2026), detergent tests by SRF Kassensturz and Saldo, and SECO on the Swiss Price Indication Ordinance. This week's actual promo prices are live in the Rappn app, not in this guide.

Rappn is the only neutral grocery price comparison app in Switzerland, with no commercial agreements with any retailer or detergent brand.

Why brand detergent is almost always on promotion somewhere

Detergent is a classic promotion category in Swiss retail. An investigation by the consumer magazine K-Tipp concluded that brand detergent in large packs is sold almost exclusively through promotions, with advertised discounts sometimes above 50 percent. Denner told K-Tipp that roughly half of its detergent revenue comes through such promotions (source: K-Tipp).

There is a legal backdrop. Under the Swiss Price Indication Ordinance, a crossed-out comparison price may only be shown if it was actually charged beforehand, and the self-comparison rules have become more flexible since 2025 (source: SECO). K-Tipp criticises that large brand packs hardly ever sell at the reference price. The practical conclusion: treat the "instead of" price on detergent as weak information. What matters is what one wash actually costs, and whether the promo price beats your own-brand baseline.

One more finding from the same investigation: according to K-Tipp, jumbo packs do not always contain the same formula as smaller packs of the same brand name. That is another reason to judge by price per wash rather than pack size.

The promo calendar: when detergent tends to get cheap

K-Tipp analysed eight years of promotion data from Migros and Coop and built a promotion calendar from it. For detergent, two recurring windows stand out (source: K-Tipp promotion calendar, via 20 Minuten, January 2026):

These patterns are probabilities, not guarantees. No retailer promises that a specific brand will be discounted in a specific month. In practice, however, it rarely takes long before Persil, Ariel and Co. reappear at a deep discount at one chain or another. That is why the most important rule on this page is simple: never buy detergent at the regular price; wait for the next promotion and then buy enough for two to three promo cycles at once. Powder keeps well when stored dry; buy liquid detergent in smaller reserve quantities.

Price per wash: the only honest comparison number

Pack prices are nearly useless for detergent, because size, dosing and the number of wash loads vary constantly. Divide the price by the number of washes stated on the pack, and every product becomes comparable. Tests by Kassensturz and Saldo show how wide the spread is:

Those figures come from a 2017 heavy-duty detergent test by Kassensturz and Saldo; today's prices differ, but the size of the spread is the point (source: SRF Kassensturz, Saldo). In a Kassensturz test of twelve colour detergents, prices ranged from 10 to 97 rappen per wash, and the top three, including Coop Oecoplan and Ariel, sat in the middle of the price range (source: SRF Kassensturz, K-Tipp). Expensive does not automatically wash better, and cheap does not automatically wash worse.

Own brand as the baseline, brand promos as the opportunity

The smart strategy has two steps. First, know your baseline: the everyday price per wash of own brands such as Total and M-Budget at Migros, Prix Garantie and Oecoplan at Coop, Tandil at Aldi and Formil at Lidl. Second, when a brand promotion matches or beats that baseline per wash, stocking up makes sense; when it does not, the own brand stays the cheaper choice. At Denner, brand detergent moves heavily through rotating promotions, and Otto's and Aligro regularly carry brand lots and large packs that you can check with the same arithmetic.

To see where your baseline sits and which products cost the least per load, read the guide to the cheapest laundry detergent in Switzerland. For the bigger picture with cleaners, dishwasher tabs and softener, see the guide to cleaning and laundry products.

This week's detergent deals, live in Rappn

This guide explains the system but deliberately quotes no current weekly prices, because promotions change constantly. This week's detergent deals from Migros, Coop, Aldi, Lidl, Denner, Aligro and Otto's are collected and compared neutrally in the Rappn app, searchable by brand and filterable by price and canton. Over 10,000 offers, 100% free. One look before you shop shows whether the current promo really beats your baseline or whether waiting for the next cycle is smarter. Start with the cross-chain price comparison.