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Color-treated, porous hair benefits from gentle cleansing that minimizes dye leaching and cuticle swelling. pH-balanced (near 4.5–5.5) formulas help keep the cuticle compact, preserving reflectivity and reducing mechanical stress. Sulfate-free surfactant systems (e.g., glucosides, isethionates) tend to be milder on color molecules than strong anionics like SLS, helping longevity. Conditioning polymers, silicones, or cationic agents can improve combability, reduce friction, and provide temporary cuticle smoothing, which is vital for porous strands. Clarifying shampoos are valuable for removing product/mineral buildup but are typically higher pH and more astringent; use them sparingly and follow with intensive conditioning and pH-restoring rinses. Bar soaps generally have a high alkalinity unsuitable for hair and can cause roughness and color fade. Baby shampoos are formulated for mildness to eyes, not necessarily for color retention or adult hair needs, and may lack substantive conditioning for porous hair. Always customize recommendations based on porosity, elasticity, and service history.