Got an awesome new pair of Nike sneakers a couple months ago? And now they look three years old? Fear not. Tears and discoloration notwithstanding, your Nikes can look like new with a few easy steps. Get rid of excess dirt. To avoid staining, this is best done as soon as possible after your shoes are exposed to dirt. Use a clean, soft-bristled toothbrush to gently clean the outsole. Prepare some suds. Fill a sink with warm water, and mix in a little bit of laundry detergent. Don’t overdo it. You want a mildly soapy liquid.
If you are cleaning Nike Flyknits, use cold water, as hot water can damage the fabric. You should also use a mild cleanser like Jergens Mild or Purpose rather than laundry detergent, which has chemicals that could affect the dye in the Flyknit fabric
Give your shoes a sponge bath. Using a sponge, microfiber cloth, or washcloth, gently scrub the dirty parts of your shoes. Don’t use too much liquid; you don’t want to get your shoes any wetter than you have to. Rinse the soap off the sponge, microfiber cloth, or washcloth with warm water, and use it to wipe the soap off your shoes.
Let them dry. Leave your shoes out to air dry in a well-ventilated room. You can put them in a sunny spot to speed up the process a bit, or use a blow dryer on the cold setting, but never put them in a dryer.
You can stuff your shoes with paper towels to help them keep their shape, but bear in mind that they will take longer to dry without any airflow.
Putting a tumble dryer fabric sheet in each shoe can help them dry faster, and freshen them up a bit.