dear brother,
let me explain what i know
we can correlate sky and cloud with good and bad thoughts if ones density is high the other wont dominate..
there is one technic to separate thought what u asked one is the actions doing with attachment is one kind of thought and another one is action doing with unattachment this is another thought(oneness)
there r two thoughts one is deiva(good) thoughts and another one is asura(bad) thoughts so u pls compare the good thoughts with sky and bad with clouds...
so to remove the bad thoughts u should not try to vanish or control it. if u do it instead of vanishing, it will stick like glue that is beautiful property of asura...to rip it out practice deiva(good activities) which automatically wipe off asura by realization instead of control it.