I use a power washer (Ryobi 2000 psi), maguires car cleaner (a liquid polish that allows me to gently rub out any sticky stuff with a small towel) then any good wax (I usually use nu-finish but years ago a guy moving to Cali gave me his menagerie of bottles in his garage, so I've spent a decade trying to use up his random stuff of turtle wax, liquid glass, armorall, etc.)