The serving tray is the insert that snaps in and out of the main tray. The serving tray is top rack dishwasher safe (or use the bottom rack - without using the drying cycle). The main tray that comes with these models is not dishwasher safe.
Some high chair pads now have Nano-Tex® technology to repel spills and stains. This advanced fabric enhancement is a durable transformation of the fabric fibers, to keep your high chair beautiful and new looking longer. Take a look at their website for more information on Nano-Tex®.
