A Few Questions About Some Estate Pipes

So I snagged a 6 estate pipe lot off of Ebay for 19 bucks. Got 2 Grabow Grand Dukes a Grabow Duke, another grabow, not sure the model as I cant make it out but it's the solid blue kind, A CAO meerschaum and an unsmoked pipe that has no maker and the only stamping I can find is "Genuine Briar" So my 1st question is does anybody have any information on the unsmoked pipe. Here's some pics.



My 2nd question is what's the best way to get the meerschaum back to its smoking glory. I have looked online and cant seem to find a solid answer about the best way to sanitize and clean it. This is my 1st meer and would like some advice from people who have done this before. Also here is a pic.

Who ever had these pipes before me did not believe in pipe maintenance. The grabows have the worst cake build up I have ever seen. I do not own a pipe reamer so I'm curious about how to remove it without one. A pocket knife then sand paper maybe?
Thanks in Advance for help/suggestions, here is a pic of the worst of the build up.

Also one of the Grand Dukes has a blue Spade, I know that grabows have been made with a few diffrent color spades. What does the blue one mean exactly?

I honestly dont even know how one would load the pipe to smoke it at the point they are in lol. And I will post some before and after pics of the CAO once I get the courage to start working on it. This being my 1st time actually holding a meer I am surprised how light it is, should be a great clencher.