Do anyone really have a consistent problem with this??
Unlike some people who only change their lenses in a sterile environment in a sealed room and always have a clean table close at hand I sometimes change lenses outside when the wind is blowing up a dust storm or it is raining. The only place to lay a lens down is on a tree stump or in the mud.
So occasionally I do get a dust particle or two on the sensor.
You should carry around a portable HEPA laminar flow hood. Neuro has a sideline selling them.
5D III, 7D, Powershot SX50, 300/2.8 II, 1.4xTC III, 2xTC III, 70-200/4 IS, 100-400, Sigma 400, 24-105, 15-85, 50/1.8, Sigma 10-20