replace() removes the whole word not the character

I have a dataframe with prices in $. I want to do calculations on it but the $ makes it impossible. I’m trying to remove it using df.iloc[:, 4].replace("$", " ", regex=True) but unfortunately nothing changes. If I add inplace=True then whe whole word disappears. What am I doing wrong? Tried many stackoverflow posts but nothing works. I cant use str.replace() because its about the whole column not one word.

My code:

    order_id    quantity    item_name   choice_description  item_price
0   1   1   Chips and Fresh Tomato Salsa    NaN $2.39
1   1   1   Izze    [Clementine]    $3.39
2   1   1   Nantucket Nectar    [Apple] $3.39
3   1   1   Chips and Tomatillo-Green Chili Salsa   NaN $2.39
4   2   2   Chicken Bowl    [Tomatillo-Red Chili Salsa (Hot), [Black Beans...   $16.98
... ... ... ... ... ...
4617    1833    1   Steak Burrito   [Fresh Tomato Salsa, [Rice, Black Beans, Sour ...   $11.75
4618    1833    1   Steak Burrito   [Fresh Tomato Salsa, [Rice, Sour Cream, Cheese...   $11.75
4619    1834    1   Chicken Salad Bowl  [Fresh Tomato Salsa, [Fajita Vegetables, Pinto...   $11.25
4620    1834    1   Chicken Salad Bowl  [Fresh Tomato Salsa, [Fajita Vegetables, Lettu...   $8.75
4621    1834    1   Chicken Salad Bowl  [Fresh Tomato Salsa, [Fajita Vegetables, Pinto...   $8.75

Then I call function replace() but the table stays the same: df.iloc[:, 4].replace("$", " ", regex=True)

Thanks in advance

Answer

df.iloc[:, 4].replace("$", " ", regex=True)

Alternatively:

df.iloc[:, 4].replace("$", " ")