I just attempted a dagger with a bit of a fullered groove and really struggled with getting the groove sanded at the end. What is the best way to clean up a fuller groove on a blade?

You could try scraping followed by sanding.
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Wrap sandpaper around a dowel that is the same size as the grove? Hand sand, or chuck it in a drill and power sand? Just a thought.

Use the 1/2" contact wheel on your bader. Dress your cratex wheet to the proper shape. Have your apprentice do it!

Although some of Brother Thomas's suggestions are tongue-in-cheek, Cratex in a rotary tool will probably get you most of the way to where you need to go. If the fuller is really rough, make a scraper to clean it up first.

Actually they are all tried and true methods!

Of course most folks dealing with fullers have a collection of different sized dowels to use as sanding blocks, some may even be made from nylon or with a layer of thin leather glued on a wooden dowel to provide harder or softer sanding surfaces.

Scrapers are a good idea too.

One quickly learns that cleanliness of forging is right up there with godliness and finish working of the fuller with clean up tooling---think of a flatter for fullers---can save hours if not days of hand work.

The bader with an appropriate sized contact wheel is a marvelous thing!

Oh, I know -- but few of us have a Bader with a 1/2" contact wheel, or an apprentice, and those who do wouldn't be likely to ask the question. ;)

this is one of the reasons to have a dremmel and edm stones and shaped wooden blocks , and thats after the bader small grinding wheel had done its stuff.
Getting an industriaL FORDHAM type tool has changed a lot of the ways I work.

My Bader B3 was not cheap, but there is a reason we pay the price for these tools. Its hard enough making some of these things without having to fight our tools also.

Experience helps, so does having the proper tools. We either hand sand or avoid fullers until we can afford the tool, or find another way.

thanks everyone for the inputs. I will try a variety of methods on my next project.

By hand sanding it's easy to loose the the crisp edge of the groove. Finish the groove first then move on to the rest. One place where a power tool can do a better job.