Do your local touchless washes all include underbody rinse?
The cheapest option here never has that option.
I put all my bets on seal & shine. Used it last winter with impressive results. Will use it again this winter.
I do not have experience with C476 but if it’s anything like 845 it never lasted me a full winter. I’d have to do a clay and prep in the spring once over. With Seal & shine I was able to just wash and reapply last spring.
Whatever salt formula their using here these days is different. Eats through just about anything. Seal and shine does get pretty weak by spring but it never required me to reapply in the winter.