I always insist on washing my face with cold water, even in winter. I feel good. Not only is my skin firm and elastic, but my rhinitis seems to have improved a lot. However, it seems that it is better to wash your face with cold water. Don't use soap, facial cleanser or anything, otherwise the pores will shrink unclean when they are cold, which is not conducive to the product's effectiveness. In fact, it is good to get used to cold water and warm water, as long as it is not too hot ~