I have a Hohner Chromatica (double bass) harp from the late '70s. 15 holes on bottom E to E and 14 0n top with the sharps & flats. I want to clean and freshen it up. Are there any particulars I should be aware of or is it the same type procedure as cleaning a diatonic? I've never opened it up & have used it very little so tuning is not a major issue here.Buck