Yes, dry cleaners here clean them, too, so I'm sure they do in CA. I'd go try them on first if you can - my concern would be that they're so flat there isn't that much arch support for walking but I have terrible feet so maybe it wouldn't matter for you.
I haven't got the slightest idea how to change people, but I still keep a long list of prospective candidates just in case I should ever figure it out.