By
its very nature the denim fabric tends to discolor, especially in the
case of a particularly dark dye: this is also part of its charm.
However, if you want to reduce this problem and keep the original dye,
it is a good idea to wash the jeans at low temperature, preferably
inside out, with a detergent for dark clothes.
Inside its factory,
the Lavanderia Industriale Lavaredo deals with jeans washing, using the
latest machinery, which leaves neither fading nor white lines in the
rubbing points.