Best way to restore air cleaner

Agree on the Evaporust, I have had excellent results with it on my KH calipers, spindles, lower and upper control arms, and a lot of nuts and bolts.

I degrease the part and try to get a lot of the surface rust off the part with wire or nylon brushing before I dunk it in the Evaporust. My restoration thread has some of my results.

It is pricey, the cheapest I have found it is by ordering online through Home Depot in the 3.5 or 5 gallon buckets. Make sure you completely submerge the part, I found out you get a "tide" line if the part is sticking out.