How long do you leave in the Infusium 23 leave-in treatment?
Answer by HawaiianGirl (6905) Thr Infusium 23 leave in treatment is a treatment that is meant to be left in your hair, which is what they mean by “leave in”. You apply the product to your hair, comb it in and allow it to dry. It is a conditioming treatment for your hair, and will not damage your hair once it is applied.