i waxed my trac awhile ago and it got on the bumer and a bit of the trim

how do i get the damn white stuff off?

?? i have scrubed some of it out but some of it is either gunna take a long time to srub or just wont scrub
also if i cant scrub it out can i herculiner my bumpers and side mirrors? =)
they always told me to make sure i did preventative maint lol