Yes, it is recommended to wash out the heat protectant spray after using heat styling tools. While heat protectant sprays are formulated to create a barrier on the hair to minimize damage from heat, they can accumulate on the hair over time. Leaving the residue of these products on the hair can lead to product buildup, which may weigh down your hair, make it look greasy, or affect its overall health. Therefore, it is important to cleanse your hair regularly to remove any residue from heat protectant sprays. Additionally, washing your hair allows you to replenish moisture and nutrients, maintaining its health and vitality.