I used to have many dealership T-shirts. I parred down quite a bit. Of the ones I have now, 90% have dealer info... I have just about as many other brand motorcycle shirts and 99% of those don't have any dealer info...
What I did with our no longer worn shirts was I found a women on e-Bay that makes high quality quilts using t-shirts. For some of the panels we used just the front of the shirt, for some we used the back (the dealer info was on the front of these shirts).
We now have a king size "custom" harley quilt made from our no longer worn shirts. It hangs in our "Motorcycle" themed room.