Join Date: Apr 2006
Thanked 155 Times in 152 Posts
Rep Power: 12
Suggest you call Collinite, they're fast to answer the phone. Generally "car wash" boat wash or aircraftr wash products are designed to clean without removing the wax, while other soaps are more aggressive.
Soot marks might be from a coal plant, or unburned jet fuel if there's a flight pattern over you and near an airport. Sometimes there's no way to deal with that except repeated washing and rewaxing.