I'm going to color-match my sideview mirror housings since I have some spares. They're kind of dirty from sitting for a while, so I want to thoroughly clean them before I primer/paint, but I can't figure out how to remove the glass/heater so I can clean out the inside. On 900s I know they just pop off, but are 9000s different? I keep pulling on mine and they won't come off, and since I'm not sure, I don't want to damage anything. Thanks for the help.