If being kept high by ATC or having step down descends over mountainous terrain, a very effective way to get down is to reduce to clean. When cleared for lower level, go V/S and dial in something like 5-6000 feet ROD (leave the speed at clean). Depending on weight pitch will go below 5-7 degs and speed will increase very fast. When approaching the VMO reduce ROD as required to manage the speed. When reaching the next restrain the speed is already set for deceleration too. Super for losing altitude really really fast.
Much more effective than LVL CHG and increasing the speed, since you don't get the pitch down as fast. And also less work since you don't have to dial the speed up and down.
Great fun too.
