Try these tips out!
perrin told me this:
Cleaning should be done every 7000 miles. www.unifilter.com has cleaning kits and oil. Thanks for asking!
The supplier I bought the perrin intake from:
Thank you for writing in, I will do all that I can to answer all of your questions.
The filter is meant to be cleaned with soap and water, and should only be cleaned as needed...
Normal K&N filter oil or any ITG filter oil will work. I also believe that if you contact Perrin when you go to clean the filter they will be happy to send you some of the original oil that they use originally.
hope this helps!!