How Much Detergent Does a Heavy Hoodie Need?

A heavy hoodie feels like it should need more soap. It's thick, it soaks up a lot of water, and it's been worn hard for a week. So the cap gets filled to the top, or a second pod goes in. That instinct is common, and it's mostly wrong. The amount of detergent a wash needs is set by the load, how dirty it is and the water you're washing in. The weight of the cloth on one garment doesn't change that.

Here's what detergent makers, appliance makers and the few dosing studies say, and where the evidence runs out.

The short answer

Use the dose printed on the pack for the size of load you're running and how soiled it is, and measure it. A load of hoodies is a normal load. It doesn't get its own rule.

Tide's own guidance for its HE liquid is to use the amount recommended on the pack based on the size of your load. Its Canadian powder instructions are graded the same way, with bar 2 for a medium load, bar 4 for a large load and bar 5 for a full HE load. Bosch, writing as a washing machine maker, lists three things that move the dose: load size, how soiled the clothes are, and water hardness, with more detergent for hard water and less for soft. None of them says thick fabric needs extra.

What too much detergent does

More soap doesn't buy a cleaner hoodie. Past the right dose it buys suds, and suds are a problem in a modern machine.

Extra rinses. Tide says too many suds in an HE washer may trigger more rinse cycles that could add up to 25 minutes to a cycle and waste up to 10 gallons of water. Those are US gallons, so roughly 38 litres.
White residue. Maytag's troubleshooting page lists using too much detergent, using non-HE detergent in an HE machine, detergent buildup in the washer, poor water quality and water that's too cold as causes of white marks on clothes. On a black or navy hoodie, that shows.
Buildup in the machine. Maytag recommends a monthly cleaning cycle to clear it, which tells you where unused soap ends up.

There's one part of this we can't point to a test for. A heavy brushed fleece holds a lot of water, so it seems reasonable that it also holds onto more of whatever didn't rinse out. That's our reasoning, not a measured result. We couldn't find a published study that compares detergent dose on heavyweight fleece against lighter jersey, and we'd rather say so than dress it up.

What too little does

Underdosing is the quieter mistake. Tide's wording is plain: using less than the recommended amount really just reduces the cleaning power. On a hoodie worn through a week of October, that tends to show up as a smell that returns once it warms up on you. If that's the problem you're chasing, our piece on getting sweat smell out of a heavy hoodie goes further.

Water matters as much as the dose. An older but useful study from the Virginia Water Resources Research Center, by Lovingood and colleagues in 1987, washed fabrics repeatedly in soft water (60 ppm) and hard water (172 ppm) with three detergent types. Soil redeposited onto the fabric more with each wash, and more so in hard water. The carbonate-built powder left a white deposit that built up over time, faster in hard water, and fabrics washed in hard water felt harsher. Detergent formulas have changed a great deal since 1987, so treat the specific products as history. The pattern is the useful part: hard water eats into what the detergent can do. We cover the stiffness side of that in why hard water leaves a hoodie stiff and dull.

Most people don't measure

The dose on the pack only helps if it gets into the machine. A study run by Niederrhein University of Applied Sciences for IKW, the German cosmetics and detergent industry association, put 97 people in front of washing machines with either a 60 ml or a 100 ml dosing cup. They dosed less powder than the load required, and the shortfall was bigger with the smaller cup. The same study found people loaded about 3.5 kg into machines built to hold 7 kg, and still described those part loads as full.

That second number matters for hoodies. A machine half full of heavy sweats looks stuffed because each piece is bulky. By weight it may be a medium load. If the dose follows how full the drum looks, it'll be off.

Pods and heavy loads

Pods take measuring out of it, which is the point of them. They also can't be split. Tide suggests one pod for a smaller load, two for a standard load and three for a larger one. Maytag notes that the larger pre-measured doses should only be used for large or heavily soiled loads. Two hoodies and a pair of sweatpants on their own is a small load, whatever it feels like when you carry it to the machine.

Cold water in a Canadian autumn

Natural Resources Canada recommends washing in cold water where possible to save the energy used to heat it, and warns that cramming too much into one load means clothes won't come out as clean. Cold washing is fine for a heavy hoodie. The catch is temperature at the inlet. Maytag advises that cold wash water should be at least 60 degrees Fahrenheit, about 16°C, to dissolve detergent properly. Once the ground freezes, the cold tap in a lot of Canadian houses can run colder than that. If dark cloth comes out with white streaks in January, a warmer setting is the simple fix.

What the lab standards do and don't tell you

Textile testing does fix the dose, but not for your benefit. AATCC LP1-2021, Home Laundering: Machine Washing provides standard and alternate home laundering conditions using an automatic washing machine, so that labs measuring things like shrinkage or colour change are all washing the same way. AATCC itself notes that the procedure can't cover every combination of laundering settings. It's a method for making test results comparable. It isn't a recommendation for how much detergent to put in at home, and it shouldn't be read as one.

A routine that works

Weigh the load once. Put a typical wash of hoodies on a bathroom scale and compare it with the capacity in your machine's manual. Now you know what "medium" looks like in heavy cloth.
Find the line on the cap or the pod count on the pack for that load size. Use the line, not a guess.
Go up a step only for heavy soiling or hard water. Bosch and the pack instructions both treat these as the reasons to add more. Bulk isn't one of them.
Use HE detergent in an HE machine. Maytag lists the wrong type as a cause of residue.
Watch the drum and the result. Suds still visible at the end, or white streaks on dark cloth, mean cut back. A smell that returns after one wear means the dose or the water temperature is too low.
Check the label. The care symbols set the temperature ceiling, and our guide to what the care symbols on a hoodie mean explains each one.

What isn't settled

A few common rules get repeated without much behind them. "Use half the recommended amount" is folklore. We couldn't find a test that supports it as a general rule, and Tide says outright that less than the pack dose cuts cleaning. "Heavy fabric needs double" has nothing behind it either. The honest position is that the pack dose, adjusted for load, soil and water, is the best starting point there is, and your own results on your own water are the best evidence for fine-tuning it. Our full washing and care notes are in the care section.

Sources

Procter & Gamble (Tide). Tide HE Turbo Clean Frequently Asked Questions. Undated, accessed October 2026. tide.com
Procter & Gamble (Tide Canada). How to Use Powder Detergent. Undated, accessed October 2026. tide.ca
Procter & Gamble (Tide). How to Use Tide PODS. Undated, accessed October 2026. tide.com
Bosch Home UK. Laundry detergent tips. Undated, accessed October 2026. bosch-home.co.uk
Maytag. Clothing has White Residue. Undated, accessed October 2026. producthelp.maytag.com
IKW (Industrieverband Körperpflege- und Waschmittel), study by Niederrhein University of Applied Sciences. Investigation of the influence of the size of a dosing aid on the dosed amount of detergents. Undated, accessed October 2026. ikw.org
Lovingood, R. P., Woodard, J. E., Leech, I. E., Hinkle, D. E. and Barber, J. D. Performance of Three Types of Laundry Detergents in Soft and Hard Water. Virginia Water Resources Research Center, 1987. vtechworks.lib.vt.edu
Natural Resources Canada. Make laundry day more energy efficient. 2025. natural-resources.canada.ca
AATCC. LP1-2021, Home Laundering: Machine Washing. 2021. members.aatcc.org