For a perfect tan, success relies on pH balance and residue control. Prep: 24 hours prior, exfoliate/shave to close pores. Use pH-balanced, clear, gel cleansers (CeraVe, Cetaphil). Avoid: Soaps, heavy oils, deodorants—they block DHA absorption. Aftercare: Hydration is key to slow cell turnover. Use simple, oil-free lotions (Aveeno). NEVER use exfoliants (AHA/Retinol) or mineral oil; they accelerate fading. Minimize chlorine/saltwater exposure—they strip color aggressively.