What you'll need:
A wash machine
Salt or Vinegar
Artcile to dye
Start by setting your machine to the hotest setting. I recommend also setting your machine to a small wash cycle. Add your salt and wait until it is fully disolved before adding your dye.
Once you're dye is well saturated in you wash, add your clothing- when your machine is finish filling you will want to pause your wash or if you can- set the wash cycle for a longer setting. Make sure your fabric is in the wash for a good 30 minutes at least before your machine is allowed to drain.
When your wash is finished, wash your clothes again in a cold setting and dry as normal.
And that's it!