I would not bother cleaning the pick up pipe, for the sake of £12 it is better to replace it.
why waste £12 just clean it, takes about 3min 
So your willing to risk you engine for the sake of £12

When you consider the work involved in getting to it plus with no real way of knowing it is clean you are happy to refit.
Well your nuts, skoda / VW recommend it is changed every 70k in any case.
What a stupid idea
