Is the garden too muddy to play?
A three-check test for a wet lawn, and a routine that keeps the mud out of the hall.
Read about muddy gardensGrass stains look permanent and usually are not.
To remove grass stains from kids football kit, soak it cold, rub in detergent and keep it away from heat until the green has gone. Then wash it inside out at the lowest temperature the care label allows. One laundry company advises against hot water and chlorine bleach on football kit.
For a long time I put the muddy kit on a hot wash because hot felt like clean. The knees came out a pale, stubborn green, and I had basically cooked the stain into the shorts. Cold water and patience did what the heat never did.

Before you put it in the machine
Grass leaves a green mark that sits in the fibres. A laundry company's football kit tips says hot water will "set the stain into the fabric", and a university extension guide to removing stains says never to dry the garment in the dryer until you are sure you've removed the stain completely. So the order is cold first, check, then dry.
Mud is where the advice splits. One laundry company says to rinse it off in cold water, while a laundry service's advice on children's sports kit says to let it dry and scrape it off, because wiping wet mud rubs it deeper. My default is to let thick mud dry on an old bag by the back door, knock the lumps off outside and rinse what is left cold. A quick cold rinse is fine for a thin smear, so this is a judgement call.
The stain section of the extension guide is about clothes in general. Nothing I found tests grass-stain methods on children's football kit.
If the mud is the real question, whether to play when the garden is wet is covered in playing football in a muddy garden after rain.
Tonight, not at the weekend

The sooner the kit goes in, the less time a stain has to settle, which is my reading of the advice to treat stains promptly. These five steps are a sensible order assembled from extension, laundry-company, brand and stain-guide advice, not a tested method. Read the care label first and test on a hidden spot.
Knock off the mud. Let thick mud dry, then brush or scrape it off outside. Rinse what is left under a cold tap. Do not rub a wet patch into the fabric.
Cold soak. Fill the sink, or a bucket with a lid, with cold water and add biological detergent or a stain remover. Leave the kit for a couple of hours or overnight (laundry company). Keep the water cold rather than hot. If it soaks overnight, keep the lid on and the bucket in a closed room such as a utility room, out of a small child's reach, and empty it in the morning.
Rub in detergent. Take it out and rub a little liquid detergent into each stain. Leave it 10 to 15 minutes, then check it (stain guide).
Wash cool, inside out. Turn the kit inside out and wash on the lowest temperature the care label allows.
Check, then air dry. Look at the stain while the kit is wet. If it is still green, repeat the soak. If it has gone, hang it to dry (extension, retailer).
Do not put it in the dryer until you are sure the mark has gone.
A printed number or badge can lift in a hot wash, so inside out, cool and air dry protects it too. That is common care-label sense, not a tested claim, and none of this is a tested method.
If your child has eczema or sensitive skin, ask a pharmacist or GP before changing detergent (see the NHS list of eczema triggers in the sources section below).
Five things that make it worse
Most failed washes come from one of five habits. Each has a reason behind it and a better move.
| Habit | Why it goes wrong | Do this instead |
|---|---|---|
| Hot wash or hot soak | Hot water will set the stain into the fabric (laundry company). | Cold soak, then the care label's cool setting. |
| Tumble dryer before checking | Heat can permanently set grass stains (stain guide), and the extension service says never to dry until the stain is out (extension). | Check wet, repeat the soak if needed, then air dry. |
| Chlorine bleach | A laundry company says "don't use it" for football kit (laundry company). | If a mark survives, an oxygen bleach soak is a common next step (brand guide), after a care-label check and a hidden-patch test. |
| Fabric softener | One sportswear retailer says it "coats the fibres like a film" (retailer). Nothing in the stain advice calls for it. | Leave it out. Add one extra rinse if the kit feels stiff, and let the care label have the last word. |
| Hard scrubbing | It can roughen the fabric and spread the stain. This is my reading, not a sourced claim. | Dab and rub gently, then soak again. |
If a stain is still there, the ladder runs in order. Repeat the soak, then try one oxygen-bleach soak if the care label allows, then accept a faint mark. A brand blog also suggests a vinegar solution, but I found no support for it beyond that blog.
If the stain is blood from a nosebleed, the cold rinse and the first aid are covered in what to do after a nosebleed playing football.
Make the next wash easier

This section is my judgement, not research, and I cite no colour source. Mid-tone and darker kit, patterns and dark socks show green and mud less than white or pale kit, which is observation from a lot of Sunday washing. A second set means one is always clean while the other dries.
Green, navy and patterned kit shows grass less. Whites show everything, so save them for dry days.
Two sets means one is always clean and you are never washing in a panic the night before.
Keep old shirts and shorts for the lawn so the good set stays good.
"Shall we put the garden kit on, and keep the good one for Saturday?"
Boots matter too, because the mud comes in on them. The boot choice is in choosing your child's first football boots.
What is known and what is not
A university extension guide to removing stains says to "Pretreat with a stain stick or soak with an enzyme product" for grass, and never to dry the garment in the dryer until you are sure you've removed the stain completely. It is a US extension service writing about general clothing, not football kit or children, and it gives no wash temperature.
A laundry company, a brand, a laundry service, a retailer and a stain guide give a similar order of cold soak, detergent, cool wash and air dry. They disagree on wet mud and on warm versus cold soaks. These are commercial blogs, not trials, and none tests children's football kit.
The NHS lists soap and washing detergent among possible irritants for eczema (the NHS list of eczema triggers). That is a general list of triggers, with no advice on which detergent suits which child.
Nothing I found tests grass-stain removal on children's football kit. I would rather say the order is a sensible default than pretend a study picked it, and the care label always beats any website, including this one.
Quick answers
Soak it in cold water, rub in biological liquid detergent, leave it 10 to 15 minutes, then wash cool and inside out (laundry company, brand guide, stain guide). Check the stain before any heat.
Cold is the safer default. A laundry company says hot water will set the stain into the fabric. The care label has the last word on the wash itself.
Not until the stain has gone. A university extension service says never to dry the garment in the dryer until you are sure the stain is out, and heat can set grass stains (stain guide). Air drying is safer for sports fabric (retailer).
Not chlorine bleach, which one laundry company says not to use on football kit (laundry company). An oxygen bleach soak is a common next step for a stubborn mark (brand guide), after a care-label check and a test on a hidden patch.
Sources differ. One says rinse it off cold (laundry company), another says let it dry and scrape it, because wiping wet mud rubs it deeper (laundry service). Thick mud dried and brushed off outside is a sensible default.
Nothing in the stain advice calls for it. One sportswear retailer says to avoid it because it coats the fibres (retailer), so follow the care label.
Keep going
Three places to go next, depending on what the kit looks like tonight. Do the boots too: drying wet football boots covers that.
A three-check test for a wet lawn, and a routine that keeps the mud out of the hall.
Read about muddy gardensAstro or firm-ground, and how to size them so you buy once.
See the boots guideMore on kit, rules and keeping a kickabout safe.
See Kit, Rules & SafetyTonight's five minutes
Knock off the dried mud, fill the sink or a lidded bucket with cold water and leave the kit to soak out of a small child's reach. Rub in a little detergent in the morning, wash it cool and inside out, and air dry it.