If you pay attention to rebornpipes.com, you'll see that he frequently uses a product called "Before and After Restoration Balm" that's supposed to do wonders to the quality of the briar (and supposedly the stem as well). I haven't tried it yet, but I just ordered some. It's a little pricey but the rebornpipes guy uses them on just about every pipe he finishes, so I figure its worth the investment. You can buy it here.
From RebornPipes:
"After putting the Restoration Balm through a workout on a variety of finishes and stem materials for the past two months I am pleased with the product. It does bring the dirt to the surface of the briar making it easy to clean out the deep grooves. It also does a great job rejuvenating the briar and the stem materials. I recommend the product with no reservations. There are no other products like it that I am aware of so it has its own niche. It is non-toxic and does not damage the finish on the briar or the stamping or logos on the stems. It has given me something different to use on those heavily rusticated and sandblast bowls. It works well on the surface of plateau briar. I would not say that it has saved me any time as it is an additional step to my restoration process. I think that it is worth the investment I made in it so I will continue to use it. I will keep a jar on hand in my tool box of polishes and waxes as it has found a place there that is unique. Thanks Mark for taking the time to develop these products. They fill a niche that nothing else comes close to. "
More information on the product and how rebornpipes uses it can be found here.
From RebornPipes:
"After putting the Restoration Balm through a workout on a variety of finishes and stem materials for the past two months I am pleased with the product. It does bring the dirt to the surface of the briar making it easy to clean out the deep grooves. It also does a great job rejuvenating the briar and the stem materials. I recommend the product with no reservations. There are no other products like it that I am aware of so it has its own niche. It is non-toxic and does not damage the finish on the briar or the stamping or logos on the stems. It has given me something different to use on those heavily rusticated and sandblast bowls. It works well on the surface of plateau briar. I would not say that it has saved me any time as it is an additional step to my restoration process. I think that it is worth the investment I made in it so I will continue to use it. I will keep a jar on hand in my tool box of polishes and waxes as it has found a place there that is unique. Thanks Mark for taking the time to develop these products. They fill a niche that nothing else comes close to. "
More information on the product and how rebornpipes uses it can be found here.