My oldest is 1989 from Toronto, a good friend was on an American Field Scholarship and brought it Home to NZ for me.
Next is 1995 extra, they are getting a bit old these days and I recently decided to wash them all prior to going into vacuum bags.
I have delicately hand washed the 89 Toronto in luke warm water and a recommmended powder, I couldn't get over how darkened the water became, so I rinsed and decided to put it in on a very low speed spin, rather than ring in out (twist and squeeze), my result left me really glad that I had finally done it
Also my later day Non-Concert T's, especially the white ones, and those with any white accents, the Tongue edges, have benefited from adding a half a teaspoon of baking soda along with your powder really does make them pop
still have mine from my first show in '81. Its been through the wash plenty of times; i even broke it out for an MSG show a few years back (some young'un was in awe that i saw them "back in '81." i had to remined him they were already 20 years into their run by then!