Our customer in Parkstone had solid walnut worktops fitted a few years ago and unfortunately was never advised on how to maintain them. They called our kitchen fitters in to restore the worktops as they were in a terrible state. When we supply and install oak/walnut worktops we always advise a sand and oil ever week for the first 6 weeks, then once a month for a further 6 months and then once every year. This should keep them looking as good as the day they were installed.
On this particular job we did one deep sand using machines, then a hand sand. We then applied a coat of natural danish oil. Once dry our carpenters hand sanded and again applied one more coat of natural danish oil. They came out great, happy customer.