If you are a regular exerciser, try to use two pairs of trainers and rotate them, to give them chance to dry out and �breathe�. Another simple tip is to sprinkle some Bicarbonate of Soda inside each trainer. If possible, leave ideally for a couple of days to naturally deodorise the trainers.
Simply empty it out when the smell has gone. Bicarbonate of soda is gentle and doesn�t contain any phosphates, enzymes or bleach, so any residue won�t damage or stain your socks and won�t irritate your skin.