One of the things most people really don't think about with owning a classic 80s car is just how you deal with parts you cannot replace. That's the case with the weather seals for the doors on KARR. This is not a part that is being made or reproduced for the Fiero, so you are left with only two options. You can replace them with another 30+ year old set of used weather seals, which more than likely are either in the same condition or worse than the ones you are replacing. Your other option is to make do with the ones you have and find ways to care for them and to some degree, restore them.
That's what I was doing Friday: cleaning, protecting and rejuvenating the door seals. I started by cleaning them with just water and a microfiber cloth. This is just to remove the dirt and dust.