Machine washing your new jeans – particularly raw or selvedge denim – exposes them to high temperatures and disintegrates the fibres of the fabric. Sure, your jeans will be clean, but you’re risking a number of side effects. The indigo dye could rinse out too evenly, your jeans may warp out of shape, or they might start fraying – don’t let the spin cycle stop you from customising your jeans on your terms.
Mr. Black’s Denim Refresh spray was invented to save your Wranglers from wrangling with the unintended consequences of machine washing.
Indigo dye in jeans is designed to naturally fade with every wear, eventually producing custom fades which are unique to your jeans and your jeans only. A machine wash removes enough of the dye to halt this process altogether, making them look older and duller.
Jeans leave the washing machine more shapeless than when they entered thanks to water mixing with the denim fibres. Again, this will spoil the denim’s ability to fit to your body shape as you wear it, leaving you with baggier jeans which are harder to customise.
Raw denim is unsanforized, which means it isn’t pre-shrunk. Washing (and drying) at too high a temperature leaves you with unwearably tight jeans which you won’t even be able to fit in, let alone break in.
Exposing your jeans to the heat of the washing machine too frequently will cause the fibres in the denim to expand and contract more often than they can handle, causing your jeans to rip and fray prematurely.