have you looked at them while lit even with snow? my trailers led's are so bright that even with the snow dust stuck to them they still make a bright red snowball. How thick can the snow get before it falls off? 1/2 inch maybe the most ive seen. so unless you have something catching the snow under the light and not letting it slide off perhaps?
Ive tried Pam cooking spray on my pickup mud flaps. They were all 4 clean, then I sprayed 2 with Pam.
After driving thru snow, slush, all the flaps had the same amount of buildup. The chunks "may" had come off a little easier on the Pammed side, but if there was a diff it wasn't much.
I didn't know if WD40 would work since it's a water displacement. I haven't tried anything before but was thinking there should be something out there to spray on to keep snow from building up.
I know that after a while the snow will fall off but would like it if they were always bright while driving in blizzard.
I was told they make a thing you stick on the light like a wire mesh and you wire it in to the elec, you turn them on in the snow but i still havent found where to get them yet.