The range of water temp in SF seems like 50-58 year round. So there's not much need.The range of water temps we get here in NJ is from 33* in a colder than normal winter to 82* on an above normal summer. We change our wax with the seasons here.
When I did remove wax, I typically scraped it off when it's getting soft, then rub sand on what's left with my hand or a towel.