Use a fork or spoon to carefully lift off visible tomato chunks. Avoid pressing against the stain to make sure it does not further set into the stain.
Force out excess tomato juice by subjecting water from a tap onto the back of the stain. This will also prevent the stain from setting deeper.
Apply a small quantity of liquid detergent to the tomato stains. Your aim should be to lightly cover the stain, not completely hide it underneath the detergent layer.
Apply liquid bleach onto the tomato stain with a sponge. Before that, make sure that fabric you are cleaning is bleachable or not. Coloured fabric would lose its colour if bleached against the manufacturer’s instructions. If you are unsure, it would be best not to use the bleach at all.
Properly rinse off the detergent as well as the bleach (if used). Check if the tomato stain you were cleaning still remains. Repeat this process as many times as required until the stain disappears completely.
Wash the fabric in a washing machine to remove final traces of the tomato stain. Once again, refer to the washing instructions label to determine if the fabric can be machine washed. If not, you would want to hand wash it.
If you find out that part of the stain is still remaining on the cloth, apply more detergent and set the fabric away in laundry for about an hour. During this time, the detergent would work its magic on the leftover tomato stain and loosen it up so that you can eventually remove it.
Spray standard laundry stain-removing agent onto the stain. Wash the fabric once again and the stain would vanish completely.