15 minutes won't do it. If you're going to use an ultrasonic it'll need 45-60 mins. minimum...but that'll overcook some of the cheaper ultrasonics (I melted the basket in mine!).
As far as stripping plastic...I dunno if there is a proper wonder-product. I do mainly metals, and only the occasional plastic. Have they stripped "enough" to simply prime them? Plastics tend to soak up colour and will have shades that don't like to come off, but if you can brush/clean enough so that the surface isn't packed with paint you may be able to simply prime it and carry on.
PS: What kind of brush are you using after you're dunking them?
|