What else have you used to clean a K&N filter besides their cleaner?
yeah, it does work well, but you have to be absolutely sure it does not contain any silicone additives.Found a spray on Air filter lube for motorcycles works perfect.
I would suggest trying steam cleaning as it does a great job with this. You can follow the basic instructions from the material Car steam cleaning process | What is car steam clean? where the car steam cleaning process is described - steam penetrates perfectly into the fibers and pushes dirt out of there, you can also use a steam cleaner with an extractor.What else have you used to clean a K&N filter besides their cleaner?