I usually start by pouring air-temperature water from the dehumidifier bucket into my washer , start it filling with cold water, but stand by the washer until it's about 3/4 full and then switch to warm. I can believe that modern detergents can emulsify liquids and bring particulates into suspension regardless of the temperature. But shea butter is a HARD solid at 52°F, which is the temperature that water comes out of the well at my latitude; it will have changed states from liquid at body temperature to solid completely infusing the chamois at water temperature; and there's just no way that ANY of it is going to come out in cold water. Can't speak to Lantiseptic. But I can't imagine that harsh solvents would be any better for the chamois than hot water.

I dry my shorts inside out, and I'm sure the UV radiation does more damage to the chamois than anything, but that's a sacrifice I'll make for the disinfection.