1-- A bit awkward. How about He wanted to brush up his German teaching. 2-- You have to dry your hands when you've washed them OR after having washed them.
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Mister Micawber.Can I just say: when you wash them OR after you wash them? Will they be fine?
2-- You have to dry your hands when you've washed them OR after having washed them. --Both of these are correct.