Is soap solution is acid or base or neutral?

Soaps are basic. Basic cleaners are often formulated to remove greasy materials. They are readily broken down by bases. In addition, many detergents are slightly or fairly basic because that's how they have an affinity for water. Detergent molecules contain one end that is attracted to water and another that is attracted to stuff like grease more than to water. They gather greasy ends around greasy dirt and allow it to be suspended in water. The water-loving end can be positively charged, negatively charged, or neutral but polar. It is especially easy to make negatively charged ends by making the conjugate base of a strong or weak acid, which results in a weak or strong base.