the guaifenesin in the medicine along the water will help thin out any mucous and help you get rid of it the dm in mucinex dm stands for dextromethorphan which is actually a cough suppressant
1 The clutch repair shop should check for fluid from the transmission or the engine, and fix any leaks that can cause damage to the clutch mechanism.  The repair cost could be $300 to $1,000 higher if your vehicle uses a hydraulic clutch system that contains master cylinders and a slave.
A clutch job, (new pressure plate, new clutch disc, new throw out bearing, and new pilot bearing) apparently costs somewhere between $500-$600. Replacement OEM parts cost about $170. (links off of Miata.net will get you a number of good suppliers). So if you do it yourself, you might save $300+.