Stains that have been caused by bolognese sauce can normally be dealt with by normal washing with a biological detergent. However that is not always the case and more stubborn stains can be treated as follows;

Stubborn bolognese stains can be loosened by soaking in a solution of equal parts glycerin and water. If your fabric is white then you can also soak the item in a hydrogen peroxide and water solution. If your hydrogen peroxide is a 20% volume then you need to dilute it to 1 part hydrogen peroxide to 9 parts water.

Always do the colour-fastness test before using bleaches. Never use bleach on wool, silk, flame resistant or easy-care finishes.