I would try it if you say it held dust off for 2 years. Do you have a picture of the bottle or a link to it?

303 aerospace protectant

It's the opposite of their fabric guard

303 is very good stuff, i have used it for years mostly on interior plastic/vinyl.
I washed the engine bay and it came out pretty good, mid engine doesn't really let you clean it too well. On a side note after I washed it I fired up the engine and it was running like shi_t. Misfires and stumbling idle, I have new plugs but coils were original. ended up replacing coils and found every coil with very fine hairline cracks probably causing arching and the ****************ty running engine. I replaced all of them and car ran perfect after, by the way I didnt drive it when I noticed it misfiring.