I want to clean up old recordings
First, a good thing to have is auto-delete, which will delete your noises automatically after one week. This is enabled by default in Settings → Noise recording → Automatic delete (might be hidden under Advanced section).
Go to the Left ☰ _menu → Noise
Long press on one of the recording and use Delete all unstarred recordings.
Also if you are getting too many noises from the night, you may consider a higher recording threshold in Settings → Noise recording → Recording volume threshold.
Tags: recording, delete