Blitz is made of polyester blended weave. it is more durable than paper element. It is durable enough to clean with water. ..
K&N claim reusable because of cotton weave with oil. oil catch dirt first then the cotton weave. you watch out the oil and hose off the cotton material. RE-OIL = reuse.
Blitz is designed to be dry. Also this way they can sell you a filter every maintence cycle. instead of K&N's one filter for life of car.
you can clean blitz and Oil it if you want but I think it is cool to Clean them and use it dry again.
You cannot clean OEM filter because the paper won't hold up after cleaning.
Just my 2 cent. you can always buy new blitz filter if you like.