Soap can help with blackheads by cleaning the skin and removing excess oil and debris that can contribute to the formation of blackheads. However, using regular soap may not be enough to completely eliminate blackheads. It is recommended to use specialized products such as salicylic acid or benzoyl peroxide cleansers specifically formulated to target blackheads for more effective results. Regular cleansing with these types of products can help to unclog pores and prevent blackheads from forming.