Personaly, I never use anything else but Jizer
Jizer will wash away with water nicely & will air dry very well.
Never been a big fan of Gunk .... Mind you I have not tried it for years & the formulation may have changed since then
Parafin ( Kerosene ) Used to be popular with us older folks
These day's, I remove the worst of the grime with a scraper, brush well with Jizer & leave for 20-30 mins, give another good brush with Jizer & then give it a good going over with the pressure washer ( A garden hose will do ).
When I am in a hurry, i'll blow dry with compessed air.
If you are ultra lucky & have access to a steam cleaner, with the right detergents parts will come out super clean
