Is the bowl briar or meerschaum? The stem looks like acrylic, so stick with warm water and a bit of unscented soap to scrub that out. Run water through the stem and scru out with pipe cleaners or shank brushes that have been dipped in unscented soap.
If the stem detaches from the metal gizmos, the usual applies, alcohol, lots of pipe cleaners, careful sandpapering of the chamber, as little contact between meerschaum and alcohol as possible. Metal polish, like Simichrome for the metal surfaces, etc. If it can be dismantled, so much the better.