Isopropyl alcohol is your friend for cleaning any dirt in a computer/electronic world. You can buy it in any computer parts shop.
TomE gasoline de-doming method(you got Blyfri 95/98 gas?) is the best of all for me... And I can say that I tried all methods. Same tint shifting as with any other de dome method if done under 1 hour (it can be done in 50 minutes).