Look for my post under "Fire Hazard", where there was a great response to the leaves under the master cylinder area. Condensed version - a resistor resides down there, and it gets hot, lights the leaves on fire!
I used a shop vac and a piece of pvc pipe as an extension. Sucked it all out of there, easily.
1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)