清除

She tried hard to banish this idea from her mind. / She tried hard to clear/purge her mind of this idea.

remove barriers

pluck up/out weeds in a garden; weed a garden; clear weeds of a garden

remove a hidden danger

cleanse the heart of/from sin; cleanse one's thoughts of sin

root out corrupt officials

comb out traitors and spies

clean up the roadside litter

clear a furnace/stove of ash; clear/clean/remove ash from a furnace/stove

clear/chuck away rubbish

sweep the dust from the carpet; vacuum the carpet

clear sb out of a party; expel sb from a party