Hey All,

So over the past year my airfilters have turned into a discoloring effect. From blue to an ugly brown color. I tried to clean them with soapy water, but no change. I'll buy new air filters if necessary but am curious if anyone else had the same issue or had some type of secret to get the brown color off of it.

 

I know K&N makes filter cleaner kits and they are availabler at almost any auto parts store,but your discoloration problem?,I can`t answer that.

 

I've never had an intake with a foam filter element. I suppose anything that will cut grease and not degrade foam. What type of detergent/soap have you tried? Wondering if something like "Shout" laundry pre-wash might work.

 

The filter cleaners also come with an oil to spray on the filter.

here's a quick link How to:K&N Air Filter Cleaning Instructions

 

edit

 

I'm not aware of anything that will completely clean the stains. If the filter is an ugly brown color because it is old, crusty, and brittle, then you should replace it because small pieces of brittle foam will gradually fall off and get sucked into your engine.

The GReddy foam filters are the "dry" type that can be cleaned but they should not be oiled.