如何从我的数据帧中删除\xa0$？

import pandas as pd

df = pd.DataFrame({'col1': ['$100', '$200', '$300']})
df['col1'] = df['col1'].str.replace('$', '')

import pandas as pd

df = pd.DataFrame({'col1': ['$100', '200$', '300']})
df['col1'] = df['col1'].str.replace(r'\$', '')

import pandas as pd

df = pd.DataFrame({'col1': ['$100', '$200', '$300']})

def remove_dollar(value):
    return value.replace('$', '')

df['col1'] = df['col1'].apply(remove_dollar)