Sometimes you will see “black or brown” marks on items, which can end up being scrud (old detergent/fabric softener grime). For this, we'd recommend cleaning cycles to remove the build up that is dislodging during the cycle and leaving stains on your clothes.
What causes brown stains on clothes after washing? It's called oxidation. The same chemical reaction that happens when you cut into an apple and it starts to brown. This reaction can happen to invisible stains like white wine or sweat on our clothing. Over time, it's gonna oxidize and turn brown.
It is important to check the machine's water inlet hoses and valves for any signs of corrosion or damage, as these can lead to brown stains on clothes and the floor. Additionally, the machine's internal drum and other metal parts should be checked for rust or other types of corrosion, as this can also cause stains.
Best guess is that you're using too much detergent (and possibly fabric softener/dryer sheets) or pouring the detergent directly onto the clothes instead of adding it to the washer first. I'd try rerunning it in a cycle without detergent and using much less detergent moving forward to see if the stains stop coming.
One of the most common reasons a washing machine will leave stains on clothing is because its drum is dirty, often from items that were poorly washed before or thanks to build-up over time.
Once the rust is loosened and comes in contact with the water flowing through the pipe the rust turns the water brown. The rust will flush itself out, but the best way to hasten its removal is to run the cold water only from the lowest point in your house.
Inspect your washer for rust
If your washing machine is older, there could be rust on the inside of the washer. That rust can transfer to your laundry, especially if wet clothing isn't removed immediately after the rinse cycle. This can happen whether or not you use bleach to wash your laundry.
Additionally, towels that are stored in humid or poorly ventilated areas are more prone to bacterial growth and subsequent discoloration. Excessive use of bleach can also contribute to brown towels. While bleach is a powerful whitening agent, overuse can weaken the fibers of the towel and cause discoloration.
Baking soda
Try using it to create a stain-removing paste by mixing a tablespoon with water, or alternatively mix it with hydrogen peroxide or white vinegar. As well as spot-cleaning, you can also add baking soda to a regular wash or soaking clothes in water with baking soda overnight.
Brown stains often indicate rust buildup in the drum or hoses, mold or mildew inside the washer, or sediment from hard water deposits. Cleaning the washer regularly, inspecting for rusted parts, and using a water softener for hard water can solve the issue.
Hard Water If your area has hard water, mineral deposits like iron and manganese can build up in your washing machine over time. These minerals can oxidize and contribute to the brown sludge problem.
Likely, the gray stains are caused at least partially by grime and dirt that has built up in your washer. Run your washer for a full cycle on hot water with a cup of bleach in the mix.
Washing machines can leave stains on clothes due to issues like a dirty drum, old or moldy gaskets, damaged drive belts, worn-out ball bearings, chipped enamel rusting or improper distribution of fabric softener.
Sprinkle salt and squeeze a little lemon juice onto the stained areas. Leave the item of clothing out to dry in the sun for half an hour. Rinse the salt and lemon juice off the garment with a mixture of water and a small amount of vinegar. Wash the clothing in your washing machine using regular detergent and hot water.
Check the Drum and Seals: Inspect the inside of the washing machine drum and the rubber seals around the door for any signs of buildup, mold, or residue. Sometimes, these can transfer onto clothes and cause staining. Clean the drum and seals thoroughly using a damp cloth and mild detergent.
Water is a natural solvent. Given the needed time and conditions, it will dissolve anything it comes in contact with. Depending on where you live, your water can contain iron or manganese, which can cause rusty-orange or black stains.
Oxidation is a common culprit, especially for garments made of natural fibers like cotton or linen. Mold and mildew growth in damp storage environments can also contribute to brown stains. By identifying the cause, you can adopt the appropriate approach to tackle the stains effectively.
When water containing a lot of iron mixes with chlorine bleach in the washing machine, a chemical reaction occurs causing a rusty substance to form and cling to clothing. That's why you see those yellow, red and brown splotches when you pull your laundry out. It's not you, it's all that iron in your water!
Scrud is the name given to the waxy build up that can occur within any washer when the Fabric softener comes into contact with detergent. This build up is not brought about by a fault in the machine.
Run an empty, regular cycle on hot, using two cups of distilled white vinegar instead of detergent. Add the vinegar to the detergent dispenser. (Don't worry about harming your machine, as white vinegar will not damage clothes.) The hot water-vinegar combo removes and prevents bacteria growth.
Scrud (soap scum + crud) stains can be removed using a 1:1 solution of distilled white vinegar and warm water. Gently dab the solution onto the affected area with a clean cloth. Allow it to sit for a few minutes before washing the garment again.