How often do/should you clean these?

Ni

I don't know what they're called in English?

They're on the outside of the window and roll down 😅

I was just wondering how often I should clean them 😅

#edit for context:

I am asking because I just cleaned them and I feel that shape was just too bad and I should have cleaned them sooner.

Also I thought blinds were inside 😅 I am not native to English.

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