How to clear all baked illumination data, except for one object

Hello,

I would like to clear all of the baked data I've done into a scene, except for one or two objects (floor and walls), and have the rest of the scene illuminated in realtime. I bake the lights, having every object in lightmap static,

but
1. if I try to delet a lightmap from the poject folder, the mesh will stay completely black,

1. or if I uncheck the lightmap static on an object the bake is still visible on the mesh

Is it possible to clear baked data only on specific objects without losing all of the baked data? I want to keep the floor and walls baked data because I like the way the shadows look on them.