Comparing two columns with same value but different font format

[doug2019]

Hi! I have a column of a dataframe with city names in capital letters and I wanted to compare it with the cities column of another dataframe with regular letters. It would be like a join. Join the two columns to compare the values ​​and search if any of them are missing. Below an example of the columns and values:

df1([CITY])
df1
CITY
WASHINGTON D.C.
NEW YORK
SAN DIEGO

df2([City])
df2
City
Washington D.C.
New York
San Diego