Assuming you are talking about the Joovy Foodoo High Chair, here are instructions for cleaning it:
The Foodoo High Chair is easy to clean! The seat and tray can be removed and washed with soap and water. The leatherette upholstery can be wiped down with a damp cloth. If necessary, the upholstery can be spot cleaned with a mild detergent. For tough stains, we recommend using a diluted bleach solution (1 part bleach to 10 parts water). Please do not machine wash the upholstery or submerge any part of the chair in water.
To clean the frame, simply wipe it down with a damp cloth. If necessary, you can use a mild detergent on the frame. Do not use harsh chemicals or abrasive cleaners as they may damage the finish.