I use a damp microfibre cloth on plastic trim items along with fabric items. If the mark resists on a fabric item I gently rub with a kids nail brush, don’t use something too aggressive/stiff.
There has been nothing I cannot remove with Elbow Grease, it really is a good product which is much cheaper than anything your find the Auto Detailing area of Halfords and the like. I have tried all the more expensive products on the mould spores on the door cards, nothing removed it.
Kind regards,
Tom