[sdiy] Soaking keys to remove filth and paint speckles - what solution?

[Casio Rapman]

Good morning!

Here's a question I'm sure some of you can answer.

I'm restoring a keyboard (plastic keys) which is absolutely filthy.  I've 
decided the best route is to remove all the keys and soak them.  They're 
covered with filth and speckled with paint.  Does anyone know what solution 
I can soak them in which will remove all this dirt and especially paint 
without damaging the plastic?  I prefer something which works quickly and is 
safe to breathe.  Any suggestions would be really appreciated.

(I've currently got them in a mix of lukewarm water and hand soap, but 
figure there's something better and faster out there.  The black dirt's 
coming off ok with a little scrubbing but the paint requires a little more 
work than I'd like to do.)

Thank you!!

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