Originally Posted by rickair7777

We used to call that "Four Day Grey".

I change shirts every two days... and I do 1-2 leg days in plane that has good AC, doesn't drip oil on me, and is tall enough not to grease my shirt on the walk around. If you're not sweating a lot you can touch-up iron your shirt and keep wearing it, but the problem is that the iron will tend to "lock in" any small stains you may have accumulated, especially grease. Once ironed in, even Shout won't get them out.