Cleaning Pipercross filter advice?

The Oily Bits S1 Specific Topics
1

While carrying out a few checks on the car for friday i’ve removed and found the air filter element very dirty.
What’s the best thing to clean and lubricate the filter. Do Pipercross sell something and were is the best place to buy?

2

Found some, thanks!

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_184958_langId_-1_categoryId_165660