The great thing about a molded plastic seat is that any spills and marks can just be wiped off with a cloth and warm soapy water. Alternatively, you can use any mild household cleaning spray, furniture wipes, or even baby wipes are handy for a quick spill. Because they are plastic you can use an antibacterial spray if needed, which is great for families with young children.
For the wood veneer legs, use a damp paper towel or a clean dishcloth and wipe in the direction of the wood grain. For more stubborn marks, apply a dab of mild dishwashing detergent to your cloth and again wipe in the direction if the wood grain. If you are ever unsure about the cleaning product you are using, it’s always best to test a small area of the veneer that is out of sight, before going ahead and cleaning the whole thing.