Hi its a problem often with modern cameras. What always works for me is : soft cloth and dab all over…dont rub, you may want to do it twice .. with Isocol, its a rubbing alcohol antiseptic available from the chemist.
Allow this to set dry a few hours of the next day. Then use a liquid car wax to seal it. and there you go better than new .. Make sure the liquid wax is NOT one that dries white,…….. that is a big nuisance.