Hi & welcome to another Brit!
Be cautious with Fairy Power Spray, Mr Muscle, Brake Fluid, etc, as these will badly mark transparent parts.
It will Shift Acrylic & most enamels though.
You don't say if you were using Acrylic or Enamel?
If Acrylic, then get some Windolene (Windex in the US), IF you can find it!
Otherwise try some Tesco's own Brand Value cleaner, Key ingredient is the Ammonia surfectant, whatever that is.
All is not lost if you used Enamels, but cleanup of the transparencies will be harder.
To repaint, Tamiya Clear Green, preferably sprayed, will do a nice job, If you want it darker, several thin coats.
The Tamiya Clears can be further thinned with Future, or you can add food colouring to future (or Tamiya Clear),
To get 5%, drip 19 drops of Future/Tamiya into an old film canister, then add one drop of food colouring to taste
good luck