Over time, I've learned that cleaning up estate Meerschaums can be a lesson
in delayed gratification. I used to rush into removing surface blemishes with
Everclear and wet/dry sandpaper, which works well and requires rewaxing. The
drawbacks to this are the adverse results it can have on the Patina, which is
the most time consuming aspect of bringing these Pipes back to their path of
evolution. At present, I'm dealing with this same problem of 'ashtray marks' on
a 24 year old Bekler. My approach to this is less aggressive than my past
actions, as I'm doing the best I can not to disturb the Patina, which is starting
to show more than it did when I first started working on the Pipe. Initially, I
worked on these blemishes with a white cotton rag with Everclear on it, just
enough to remove the surface grime, but not enough to draw the entire spot out
of the Block. Before smoking it for the first time, I cold waxed the entire Pipe,
paying particular attention to these blemishes, As I smoke the Pipe, I rub Beeswax
on it, with attention to these spots. After a half dozen smokes, the Pipe is
starting to show more of it's coloration and these blemishes are becoming diffuse,
so that they are less defined. This technique seems to be better in the long run,
as the Patina continues to develop more than if I'd used sandpaper. This
method of waxing also works well with keeping the bowl plateau of a new Pipe
from getting scorched, as the Beeswax works to spread the smoke marks as
well as aid coloration and provide protection for the Block. On this fine older
IMP, if you sand to cover the dings, you will have to entirely reshape the bowl's
plateau and alter the Pipe's geometry. I've an old Andreas Bauer from my early
years of Pipe smoking and it has a similar problem. With waxing and continued
smoking, the coloration has made the ding difficult to see. You can buy high grade
white refined Beeswax at fabric stores, as quilters use it on their threads. I think that you'll
get a variety of suggestions for this problem. I'm no expert but instead,
consider myself a student in these matters. The better informed you are, the more
likely you'll be to make decisions that you'll like. Let us know how you fare in
this matter.