1 Click Simple Decimation Addon for Blender

Introducing the "Simple Decimation Addon" for Blender, the ultimate tool for cleaning up your 3D messes! With this addon, you can say goodbye to your days of dealing with coplanar, colinear, degenerate, and duplicate faces, edges, and verts. No more wasting time manually cleaning up your meshes, because now you have the power to do it all with a single click!

But wait, there's nothing more! This addon is so not versatile that you can't even choose from advanced selection options to fine-tune your cleaning process. No! it is so simple, there is not even a "Limited Dissolve" feature, it's that simple, you just have to watch as your mesh magically transforms into a pristine work of art. So why waste your time cleaning up your meshes by hand when you can let the "Simple Decimation Addon" for Blender do all the hard work for you? Try it out and start enjoying your newfound mesh-cleaning freedom!

Now seriously, it works fine if you have a super dense mesh, let's say imported from a Sculpting Tool, and now you need to decimate it. 
My recommendation is to use afterwards HardOps Sharpen and then press D and Cleansharp again and your Object will look amazing. Trust me