[Kevan]

I don't trust the 'soak' method.

I tried Dettol once...never again!...the stench turned my stomach after a few hours.

Best stuff I've used is this stuff:

   

It'll take some time but use a good sized container, pour some of this stuff in then brush it on an area and keep rubbing the brush round until you see paint slowly coming off.
...I wouldn't leave it soaking though, as I said I don't trust that method