To reduce the amount of build up on a blade I had spray on bed liner sprayed onto my ATV blade which made a big difference. I had tried spraying it with various things but anything that worked, didn't work for long. The bed liner has been on there since about 2005 and still helps.
On snow blowers I tried the different spray on materials but nothing made much difference and just like with the blade, if something did help it didn't help for long so I quit worrying about it. When I am done blowing snow I always clear the blower by running it at full rpm, then raise it 2" to 3" off the ground and drop it. After doing that a couple times the blower is clear and I have never had a problem with a blower freezing up since I started doing that.
When blowing snow one thing to keep in mind is, blow by the conditions. If the snow is wet you have to slow down to give the blower a chance to clear its self. If the chute is plugging you are going too fast for the conditions. In some conditions, any speed is too fast.
I have only seen one time where the blower design caused the chute to plug. That was on a neighbors small articulating Cat loader with the front blower. The only thing I could figure is whomever designed that blower had never seen snow, let alone tried to blow it. Once I changed the angle on the impeller blades it did a lot better but was never right.