if the paint is in good clean condition just apply another coat of EGP it should be lasting you months! not mixing your shampoo too strong are you?
Dont think so, 2 caps of AG Shampoo usually does it, though its been a good 5 weeks, something like that with nothing more than a spray / wipe / spray / dry.
Also theres a quarry just over the trees oposite + live near a railway line, my car has been pretty hammered environmentally recently (plus the volcano) so its not surprising its wearing off, might just wash it down properly & EGP it again then
though this dodo juice might be an idea, need my cash to settle before i buy more stuff for the car tbh, not even got around to ordering new drying cloth yet! - might do that now