Originally Posted by mxwrench

I use twin air air filter cleaner, works great and is water soluable so you can rinse in the sink afterward. Then let em dry completely.

The spray kind is ok, I would recommend the PJ1 FOAM filter oil in the spray. It is a little thinner and less sticky than the belray but still works good.

Just stay away from the no toil. I have never cursed a oil product as much as I have that stuff!! The biggest problem for me as a mechanic is you dont know the customer has no-toil oil on their filter until you try to use conventional filter cleaner on it, but then it is too late and the stuff becomes a nasty sticky foam that wont go away with any cleaners except the no-toil cleaner! Yuk!