Silicone can emit that strong odour of plastic. Over time this smell will dissipate, but in the meantime it can be off-putting. If you are giving the silicone plastic to a child or using it to prepare food, you might want to remove the odour first with a good soak. Use natural products you likely already have in your household.
Soak a clean cloth in white vinegar, a natural odour neutraliser.
Rub the cloth over the silicone plastic to remove the odour.
Mix 1 cup of baking soda with 3 cups of water if the smell is still noticeable. Baking soda is a natural odour absorber.
Soak the silicone plastic in the baking soda solution for several hours or overnight.
Scrub the silicone plastic with the baking soda solution. Rinse in clear water.