Coat the mud film first. According to the introduction of Popular Health Network, mud film can help absorb oil and dirt on the skin surface, clean the skin, soften the stratum corneum and promote the absorption of follow-up skin care products. Blackhead removal mainly refers to the use of blackhead removal products and tools to absorb or export blackheads on the skin surface, so that the skin looks cleaner and neater. Applying mud film first can make the skin surface cleaner, and then the effect of blackheads removal will be better. So, first coat the mud film.