My Tundra has mud flaps and it doesnt matter if you are on highway or major roads with 45-50 mph speed limits. The $&^* seems to just get thrown up by other cars around you and at speed it just goes out and around the flaps. I have the same problem from about my waist line and down my truck is a mess no matter what I do. LSP always loose its beading and there is stuck on crud no matter what. Winter they use so much salt and other new chemicals to treat the roads that around here I think its impossible to keep a good daily driver during the winter. All you can do is de-con with a iron remover then a clay mitt in early spring and put on fresh coat of LSP. The top parts of the doors and hood and roof all bead like they just got fresh coat of LSP but it fades perfectly matching the salt spray line you can see when it dries on the car the day after a snow storm.
Kinda like this picture the whiter it gets the worse LSP performs after only few days, That stuff must just stick like glue or eat through LSP.
You could hire this guy to keep it salt free but might get some marring.
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