<human>:  How do I remove a stain from a shirt?
<bot>: To remove a stain from a shirt, first treat the stain with a stain remover or a pre-treating laundry product, following the instructions on the package. Allow the chemical to sit for the recommended amount of time, then launder the shirt according to the clothing label's instructions. Air dry or use a dryer on a low-heat setting. For particularly stubborn stains, you may have to repeat the process.