Determine whether the suitcase is worth cleaning.
If the suitcase isn't very dirty, don't bother cleaning it, or simply empty it and vacuum it off. After all, the purpose of the outside of a suitcase is to protect what's inside. Depending on the material, cleaning your suitcase could damage it. A little dust or dirt just adds character. If it was a terrible suitcase from the beginning and is now tattered and torn, or the latch or zipper
is hopelessly stuck, it may simply be time for a replacement. On the other hand, if the damage is bad enough, you have nothing to lose by trying to clean it.