Well, not to state the obvious, but they're not self-cleaning... meaning, K&N's do real well with trapping dust and dirt etc. for longer periods of time compared to paper - but keep in mind that while it keeps all that stuff away from your engine, it doesn't "get rid" of it.hmmm so Ive added the K&N drop in filter and do go off roading..... n its dusty during the summer..... should I clean it more often then?