While clear sodas won't be much of a stain problem - in spite of the sticky mess - if your little tykes spill root beer or strawberry soda, it's time to polish up on your stain-removal skills.
Remove any soda residue by blotting with paper towels.
Use a foaming fabric cleaner on a stain that appears on upholstery, following directions exactly.
Or, mix up a homemade stain buster for rugs and cloth upholstery: 1/4 c. hydrogen peroxide to 3 c. water. Spray on with a spray bottle and let sit for 10 minutes. Rinse with a solution of 1/4 c. white vinegar to 3/4 c. cold water. Blot dry.
For leather, use lukewarm water and a sponge to gently remove stains. Wipe the entire car seat (including crevices) and dry with a clean towel.