New Term –
Similar to “clean-to-me” or “new clean”. Items that have been worn, dirtied or sullied, then lost or stored for a significant amount of time before being found again can be called “dirtbag clean”.
My buddy wore my Knicks jersey during a pick-up basketball game last June, then set it on top of a box in his office for five months. We both forgot about it. But when I saw it lying there today, I put it right on. What used to be sweat-soaked and dirty five months ago is now dirtbag clean.