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I'm trying to clean this HEPA filter from my vacuum cleaner by washing* it and even though I've managed to get most of the dirtiness out, there's still some left sticking to the corners between each layer.

I can't reach there without a pointy object and I'm afraid of puncturing the sheet.

  1. Do I need to clean that much? (how much suction do I lose if I don't)

  2. What's a safe way to do so?

*I'm reading in some places that I shouldn't wash it, but the manual that came with my cleaner specifically told me to wash it. (and then dry)

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