I have yet to try this but if your frets and fingerboard are really gross you might consider it.
It is a method recommended by Taylor Guitar for their acoustic 6-string guitars. Not long ago, I acquired a used Taylor 6-string and am learning to play that. Obviously not everything would apply but some of their advice might be handy for a dirty electric guitar or bass guitar. I am going to try this the next time I restring that old 414-K.
Check out this link and then click on Parts 1 & 2 of the Care and Feeding
http://www.taylorguitars.com/see-hea...t.aspx?id=1004
I have used lemon oil but preferred linseed oil on my old Gibson bass. Probably not much difference. I have also used an old, soft all cotton t-shirt, and placed that over my finger-fingernail, and dug out the grime behind the frets. Takes some work and probably too old school!
You might check Music Maker's website and see if they have recommendations.