How to cleanup array of structs?

[Suliman via Digitalmars-d-learn]

I remember that there was topic about remobing data from 
struct/arrays of structs. But I do not remember what is idiomatic 
way to do it, and can't google it.

something like:
    struct MyTrack
    {
        ulong id;
        string recordDate;
        int velocity;
        int maxAllowedSpeedForRoad;
    }
    MyTrack mytrack;
    MyTrack [] mytracks;

// filling

mytracks.clean() or what?