According to the present invention there is provided a process of treating a fabric with a laundry pretreater composition comprising a peroxycarboxylic acid. More specifically, the process of the present invention comprises the step of mechanically rubbing the laundry pretreater composition into stained parts of a fabric, and subsequently rinsing said fabric in an aqueous bath and for washing said fabric in an aqueous wash liquor comprising water and a conventional laundry detergent. A kit comprising said laundry pretreater composition, instructions for treating the fabric and an implement suitable for use in the process is also claimed.