If it were me, I'd pretreat the salted/road grimed areas. Steve says bug squash doesnt hurt your LSP when diluted, but I dont see how it could help it. The way I see it, your LSP is already taking a beating, why continue the assault if you dont have to? That said, I use diluted bug squash regularly on paint and even use it in my washer fluid. Bug squash is an awesome product, but like I said....pretreat with it instead of washing the whole car in it. It's been a long time since I've lived in NY, and I wasnt big into detailling in my preteens (moved to GA when I was 14), but I can imagine what it's like trying to keep a Daily driver clean in the winter as I do remember what the cars looked like that time of year.