If U can, lining the snow shoot with a HD poly plastic will help greatly.
Most poly plastics can be heated to mould and fitted to the shoot area.
Also adding 'wipers' to the fan blades to close the gaps.
The theory is that cold wet snow will stick to metal but not to slippery plastic and seems to work, at least it does for me.
I initially proved this point as I had some very HD 8" poly tape that I lined the shoot with. Worked just fine however stones and gravel soon ripped it to shreds.
I next heat moulded some 1/4" plastic that I had hanging around and that proved to do just the trick.
This fall we had some 5-6 very wet dumpings and I only experienced but a few clogs much to my surprise and those could have been avoided had I not forced the blower into compacted piles of heavy wet snow.
I also have a pusher blade and that is another sticky problem that I plan to address with a plastic liner in the future.
One suggestion is comes spring when you store the blower to spray the bare metal areas with a rattle can of whatever you have on hand.
The idea is that there is bare shiny steel and U want to prevent any rust to form as rust will grab wet snow and then the problems start.
Nice shiny steel will do so much less.
I once tried gravel guard as I had some left over but with limited success, still was better than nothing however.
I do find that gravel guard is great for the undersides of the fenders especially if you have dirt or gravel roads.