Unable to click on signs on a map

I've written a script in Python in association with selenium to click on each of the signs available in a map. However, when I execute my script, it throws timeout exception error upon reaching this line wait.until(EC.staleness_of(item)).

Before hitting that line, the script should have clicked once but It could not? How can I click on all the signs in that map cyclically?

This is the site link.

This is my code so far (perhaps, I'm trying with the wrong selectors):

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

link = "https://www.findapetwash.com/"

driver = webdriver.Chrome()
driver.get(link)
wait = WebDriverWait(driver, 15)
for item in wait.until(EC.visibility_of_all_elements_located((By.CSS_SELECTOR, "#map .gm-style"))):
    item.click()
    wait.until(EC.staleness_of(item))
driver.quit()

Signs visible on that map like:

Post script: I know that this is their API https://www.findapetwash.com/api/locations/getAll/ using which I can get the JSON content but I would like to stick to the Selenium way. Thanks.

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