Well this is a new one and it doesnt seem far fetched, but technically every and anything other than air can mess it up...
heres a short list of things that mess them up:
Water
Mist
Excessive Airfilter Oil
Road debris that makes it past the airfilter
Blowing your breath directly on the hotfilm.... that fogs its it up. Then needs to be cleaned with MAF cleaner spray.
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