Ive never used any synthetic washes for my clothing.
Ive always washed my gear on a cool wash cycle, and never use washing powder or detergent.
Some of my gear is getting pretty old, especially two items of Buffalo gear, that are now well over their thirtieth anniversary, and apart from discolouration, have a lot of life left in them.
Just good old water on a cool temperature, that's all is required.
Modern day detergents are more likely to break down the fabric over extended use, as some of them are pretty powerful if over used.