Yes. If you are lucky, you can find a local shop that can clean the screen for you. If not, or you are just the adventurous type with some skill to work with small objects, you can remove and replace the screen using the visual instructions at the link below.
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well. If the "do it yourself" approach doesn't work out for you and you need conventional repair, please let me know.
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According to my database on film cameras the KX model does not have a removable screen, therefore the top cover and the prism must be removed in order to access the screen for cleaning. Unfortunately, there are no free resources available for diagrams or disassembly instructions.
You are quite welcome.