I made an addon for Blender called Toolbox Mesh Cleaner! I use it to make cleaning up doubles and stray vertices from meshes extracted with Switch Toolbox (and other unclean models) slightly less annoying.
You just select your mesh(es), go to the Object Data Properties tab and choose how you want to clean it:
Clean and Subdivide: Deletes loose vertices, merges by distance and calculates sharp edges using custom normal data, converts tris to quads, and subdivides the mesh.
Clean Mesh without Subdivide: Does all of the above minus the subdividing.
Clean Mesh and Keep Tris: Does everything listed above except subdividing and converting tris to quads.
Before:
After:
Feel free to do whatever you want with this addon.
Download: For Blender 4.2+ | For Blender 4.1 and earlier











