With the advent of ‘litter-less lunches’, a lot more goes into and gets stored (read: garbage) in lunch bags and lunch boxes. This means additional cleaning and diligence is required in maintaining said lunch carrying mechanism.
Usually, lunch bags have foamy inserts between the exterior and interior, and a gentle plastic lining. The exterior is a similar material to that of a backpack, so fairly durable and easy to clean.
The same cleaning method applies as for the school bag; check the care tag and see if it can be machine washed. Most good quality bags can. Use cold water and gentle detergent, and wash on a gentle cycle. To hand wash the bag, use the same mixture of dish liquid and warm water, and a soft sponge or cloth to wipe clean. Set your lunch bag to hang dry, again avoid the dryer here.
If you’ve got a stain in the plastic lining, you can create a paste of baking soda and water to remove it, simply apply with the sponge and wipe off, then rinse well.
To clean a lunch box, simply wash using a sponge and warm, soapy water. Leave upside down to air dry.
To deodorize a smelly lunch bag or box, simply leaving baking soda in it overnight, then dump out and wipe clean in the morning.