Car seats can be cleaned with a vacuum cleaner or a compressed air machine. A slightly dampened cloth can remove food stuck to the seat. Make sure the foam parts do not get wet.
The harness system should be spot cleaned only with mild soap and water. Soaking the straps can damage the webbing. Wipe the outside of the buckle with a damp cloth. Do not use bleach or harsh chemicals on your car seat and do not dry clean.