Advice in cleaning Induction Kit foam? ie HKS

[M@r]{]

Guys, I have just taken off my HKS induction kit mushroom head doobry thingamy bobs.  Figured about time I cleaned the foam.  

Any advice on the best way to do this?

[Red and Single]

I used gunk to great effect, rinse it out, apply lots of gunk, work it in thoroughly, rinse well, dry and refit.

[Warthog]

After cleaning then spray with the air filter oil you can get from Allfrauds. :wave

[Mave]

I used washing up liquid successfully on mine, accompanied by loads of rinsing