I haven't been very good about rinsing the salt water off my goggles after my swims and now my goggles seem to have a build-up of salt on them. Any suggestions on helping to de-salt them now or is it time to give up? So far I've only tried soaking them in warm water for a few hours. They are prescription goggles so I'm not sure if something strong may ruin the RX. I'm about to order new ones anyways but would like these as a backup.