From the beginning, I brush it with a toothbrush/paste and soak it in Efferdent Plus each morning.
Yet I have this white build-up that I can't get off! It won't scape, brush, or soak off and it's nasty looking!!

How can I get this build-up off?
Also, are Hawley retainers easier to maintain clean? Do they get less of this nasty build-up?
Thanks in advance!
Sue
