Site search engines are all but useless these days compared to Google with its intelligent pattern searching and auto-synonyms. Far and away the best search is to go to Google and search for:
Z4-forum remove ashtray
and it'll turn up results for removing, refitting, getting out, ashtray, ash tray, fag bin etc etc. If you're feeling excitable there's a proper syntax for limiting searches to a given site:
site:www.z4-forum.com remove ashtray
but the former is good enough 99% of the time.