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Iv just bought a foam ITG filter and in the info it says the best way to clean it is soak it in petrol, once it is clean then wash and leave to dry then re-oil with the correct spray from ITG.
I got mine from Merlin Motorsport as i live near them, i expect Halfords might sell it mate.
Foam filters should always need to be cleaned, as the oil sprayed on them is the main thing that catches dirt, so naturally the more miles driven the dirtier the oil will be come, needing eventually to be washed and re-oiled.