blow the cobwebs away

Blow away the cobwebs/blow the cobwebs away (British & Australian)/Idiom: blow the cobwebs away
This idiom has two, similar, meanings.
a) If you blow the cobwebs away you get some fresh air and exercise so that you are refreshed and can think more clearly.
b) To blow the cobwebs away is also to make big changes to something in order to bring in new ideas.

Examples of use:
a) --Let's go for a walk and blow the cobwebs away.
--'I can't do my English homework. It's too difficult and I'm tired.'
-- 'Why don't you go for a walk in the park and blow the cobwebs away? It might help you think more clearly.'
----A stroll along the cliffs will blow away the cobwebs.
b)--The new business owner has lots of innovative ideas and he's really blown the cobwebs way in our company.

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ξαραχνιάζω [ksaraxnázo] -ομαι Ρ2.1 : καθαρίζω ένα χώρο από τους ιστούς που έχουν πλέξει οι αράχνες. [ξ(ε)- αραχνιάζω]

Literally and metaphorically.

Also, in the first sense:
ξελαμπικάρω, ξεθολώνω
or
Γιατί δεν κάνεις μια βόλτα στο πάρκο να σε φυσήξει ο αέρας;

Similarly, in sense (b):
... έφερε νέο αέρα ...