preserving a signed t-shirt

[oenophilia]

I have a t-shirt signed by lots and lots of people on probably the most remarkable day of my life. Some of them are in laundry pen but others are in biro or whatever came to hand (nearly!). Said t-shirt has been worn with pride since and tbh could do with a wash, so please can someone tell me how to do that without risking losing the artwork and messages?

You can't wash it. The biro will eventually fade to invisible just hanging in a wardrobe as happened with my last day of school signed shirt. Photograph all the pics and writing in sections because a lot of it won't last forever.

Try taking it to a framing company and see what they can do with it.