How to wash an old sentimental baseball cap without ruining it

1. 1
   Soaking in water and dish soap

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2. 2
   Running it through the dishwasher

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3. 3
   Scrubbing with a stiff bristle brush or toothbrush

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4. 4
   Using laundry detergent, OxiClean, or vinegar soak

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5. 5
   Washing in the regular washing machine

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6. 6
   Washing hats in the dishwasher with regular dishwasher detergent

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7. 7
   Throwing the hat into the washing machine with the rest of clothes

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8. 8
   Using a hat cage in the washing machine

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9. 9
   Spraying with stain remover, using a soft brush, washing in the sink with detergent, and using hydrogen peroxide for stubborn stains

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10. 10
    Buy a replacement hat

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11. 11
    Unstitch the logo and reattach it to a new hat at a hat store

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12. 12
    Using makeup remover specifically on the stained part without getting the hard part wet, followed by regular soap and air drying.

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13. 13
    Using Oxi-Clean detergents in the wash

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14. 14
    Making a paste of hydrogen peroxide and baking soda to scrub into the stains and letting it sit for an hour

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15. 15
    Doing a 6-hour Oxi-Clean soak

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In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.