Spray fragrance while wearing it (it can damage the fabric)
Leave it too long between cleaning, even if not obviously stained: your skin’s natural oils can discolour the collars and underarms.
Overdry, as this can tinge the colour and make it harder to iron.
Dab stains: rubbing can make it worse.
Follow washing instructions. Always.
Use Vanish Oxi Powder: “It works wonders”