Clean start - How?

I am about to remove 1.4
I have found that for some reason I have a number of .lrcat files on the drive, taking up some considerable amount of space. My master photos' are all safe on a drive.
Can I just delete the .lrcat files and the associated folders from the HDD and start again by regenerating from the originals.
What are the dangers of doing this?
Are there any other files I should be deleting, such as backups somewhere?
Regards Kevin
Running 2.1 on a PC

The biggest users of space are, in order: The images; the Previews folder; the .lrcat file.
If you have everything on an external, you can delete all of these, but I'd double check to make sure everything is where you think. IE, that your external images don't have their catalog and previews on your internal.
With many .lrcat files, probably many are backups. You need only the most recent.

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