You will need more than hot water and washing up liquid to shift the **** that gets in there. Put some Paraffin in your cleaner and you may do so good.

you'd be surprised just how much they shift with just warm water, if I wanted to go the extra I use Acetone
 
I'd be REAL careful putting acetone anywhere near anything plastic or with o-rings! Taht's sledgehammer stuff - like Easystart. Last chance saloon stuff. And yes, I have a bottle under the bench ... been there 10 years now and still not finished.
 
try a bit of paraffin mate you can get it from garden shops thats where i am getting mine from when i get round to cleaning a few bit out
 

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