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The safest option is to use any non residue forming contact/electrical cleaner.

 

This stuff can be used on circuit boards to clean carbon contacts/connectors etc.

 

I personally use CRC Contact Cleaner. Pretty pricey stuff but rest assured it will not damage your AFM/MAF.

 

Stuff like Brake Cleaner/Degreaser are way too strong IMHO and could possibly crack the plastic bits or deform the rubberseals.

 

Cheers. :rock:


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