RFB
97 FZJ80 LIFTED SC DUAL BATTERIES,37s
Ive got the fluid film and I keep underneath very very clean but I dont like the residue fluid film leaves, so I may go your route.They blow it off a bit when you bring it in before they apply the undercoating. As I sat in the waiting area listening to the owner field calls, the shop recommended cleaning the big chunks off before bringing it in after a snow or if you've had it on a treated roads for a bit.
FWIW, not much as it's mid-December, they offer a discount if you bring it by in the Fall vice waiting for winter. I'm sure there is a cash flow component as well as a capacity limit in the winter months to how many customers they can serve.