I'm thinking about buying some Injection Cleaner for my 20xe, but am unsure of what make to get. I have tried some Slick50 a while ago but didn't notice a thing. I see in the demon Tweeks book Pg215, item2, there is some really powerful stuff that says u will notice the difference. Or am I better off having the Injectors totally removed by a pro and cleaned that way, if so would a normal Vauxhall dealer be able to do this. I know Courtenay have said this is the best way to restore factory power!! , what do u think guys?