Guide to wipe the build/environment

docs/guides/wipe-environment.rst

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+Wiping a Build/Environment
+==========================
+
+Sometimes it happen that your Builds start failing because the
+environment where the documentation is created is stale or
+broken. This could happen for a couple of different reasons like `pip`
+not upgrading a package properly or a corrupted cached Python package,
+for example.
+
+In any of these cases (and many others), the solution could be just
+wiping out the existing build/environment files and allow Read the
+Docs to create a new fresh one.
+
+Follow these steps to wipe the build/environment:
+
+* Go to **Versions**
+* Click on the **Edit** button of the version you want to wipe on the
+  right side of the page
+* Go to the bottom of the page and click the **wipe** link, next to
+  the "Save" button
+
+.. note::
+
+   By wiping the documentation build/environment, all the files
+   associated with it will be removed but not the documentation
+   itself.
+
+Now you can re-build the version with a fresh environment!