I bought the AMSOIL cleaner and foam filter oil.The oil for the filter is great but the cleaner has to be used a couple times to get the filter clean.I've used dish soap and water before,that works good to get the foam clean too.
On all my motocross bikes I used TwinAir filters and No-toil oil and cleaner. I like it because its a biodegradable oil when using their cleaner so you can do it in the kitchen sink and nothing bad will happen!!! They sell it at alot of bike dealers that sell good accessories. BelRay makes a good oil, PJ1, amsoil, Maxima, Honda does too.
Dish washing detergent and 80 or 90w gear oil will work fine. If you ride in extreme dusty conditions then I would suggest a name brand foam filter oil.
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