I use it mainly for cleaning glasses. The plastic insert should be removed, the cleaning effect is much better without him, also is a bit more room (for up to 2 glasses) available. Use warm water (just enough to completely cover the glasses), a drop of washing up liquid and approximately 6 min run, then wipe with a microfiber cloth. The result is perfect.
Addendum, after a month: Unfortunately, I'm not so satisfied, after 5 weeks ("On / Off", "timer", "Home") practically do the 3 slide switch no longer. One must press to ensure that does something 10-20x.