Haven't tried it yet, but I understand from a recommendation made to me for a similar question that simple Isopropyl Alcohol is very effective for removing old wax from trim. Couldn't paste a "clickable" link, but, if you do a search, there are articles.
You might want to Try some mineral spirits on a towel. Do a small test spot . Don't want to melt any plastics. Rub lightly. Don't want to flatten any textured plastic. Rinse well once done.