<human>:  What is the best way to clean a stain on a white shirt?
<bot>: The best way to clean a stain on a white shirt is to pretreat the stain before laundering. Use a stain remover or spot cleaner specifically designed for removing the type of stain. Work the product into the fabric with a soft brush, then put the item in the wash on the warmest setting recommended on the garment’s care label. Check the stain before drying and repeat the process, if necessary.