Decking restore?

House move. loads of decking - good job done. was cleaned and stained 6mths ago. now gone patchy, some stain flaked off. where do we start......again. do we have to strip it, stain it, oil it, seal it. ??
Answer
Well if its already been stained i would just wash it with a decking clearner and power hose and give it another coat of stain