Cleaning, maintaining finish on new-to-me loom

I recently picked up a Harrisville Designs workshop loom and am getting it into condition.  There is no glaring issue with the finish but it feels dusty.  I'd like to sort of deep clean it and brighten it up withoug making a huge project of it.  I contacted HD and was told that it was finished with a mixture of 50% linseed oil and 50% mineral spirits.  I was also told that people have used "409" on their loom.  Isn't that a harsh cleanser with ammonia in it?  I'm looking for suggestions.  Thanks.