You need a base (alkali) to remove the grease varnish. Ammonia works (with a bit of Dawn dish detergent) and for the really tough spots you can use lye (sodium hydroxide) or spray-on oven cleaner (also good for degreasing really nasty engines). Be careful with lye around paint -- I generally try to stick to ammonia for most things, but I once lifted the paint on a really greasy stove-top fan/light fixture with lye. You can get extra-strong ammonia from True Value hardware stores ... I think they call it "janitorial grade" ammonia.
I tell you two things that are guaranteed to work and are available on your side of the pond.
Sugar Soap and sweet orange pure essential oil - it`s gentle but thorough enough to completely degrease a mucky car engine so kitchen cupboards or an oven are a doddle for orange oil; it`s an organic solvent so not much scrubbing involved.
Lemon oil or pine oil are both just as effective too and double as a disinfectant, virucide and mould killer.
Get the steam distilled 100% pure oil - not the orange fragrance oil - that`s chemical garbage.
I know this because I`m a medical herbalist for 30 years and use essential oils everyday.
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