I recently acquired 6 estate pipes, and they have some 'patina' to them to say the least. That said, I started cleaning them a few days ago, and I started with the one that I've been smoking myself since 1983, with only pipe cleaners and some alcohol of some description as a solvent. After the salt and alcohol treatment on it, the next morning the salt was quite literally 'black' not brown...black. Question I have is; 'Should I give it another round of salt and alcohol, or leave it alone'... It has been forty years without a good bath after all.