Freshen up your bag
Fight odours in gym bags by placing a few dryer sheets inside. Try Essential Waitrose Fresh Tumble Dryer Sheets (£1.80 for 40).
Sweat stains
Prevention is better than cure. For old stains on cotton, soak clothing in an enzyme-based treatment (try Bio Tex stain-removing powder; £2, sainsburys.co.uk) then scrub the marks with a nail brush. Machine-wash with a biological detergent, adding stain remover to the load. If that fails, soak the garment for 30 minutes in a sink of cool water with 5-6tbsp of bicarbonate of soda. Wash again, then dry naturally.
Wet trainers
These will start to smell if you don’t dry them out fast. For a quick fix, stuff with scrunched-up newspaper to speed up the process. Avoid drying near direct heat. Don’t machine-wash your shoes unless the manufacturer says you can.