Lungs - remove large amounts of CO2 (18 litres/day) and also significant quantities of water every day.
Liver- secretes bile-containing substances like bilirubin, biliverdin, cholesterol, degraded steroid hormones, vitamins and drugs. Most of these substances ultimately pass out along with digestive wastes.
Sweat and sebaceous glands - These glands of skin help to eliminate small amount of urea, NaCl and lactic acid etc. through sweat while subaceous glands help to eliminate some substances like steroids, hydrocarbons and waxes through sebum.
Saliva - It can help to eliminate small amount of nitrogenous wastes.