As with other contact lenses, our first choice for overnight disinfection is a 3% peroxide system such as AOSEPT or OXYSEPT. These are tough on germs and very gentle on eyes. Once disinfection is complete (after 6 hours) the solution is reduced to sterile, non-preserved water. There is nothing purer you can put in your eye.
We do not generally recommend all-in-one solutions which contain preservatives as well as cleaning agents, both of which can be toxic to the eye.
However, we do recognise that for some circumstances (such as travel), all-in-one solutions can be handy, and in these cases we recommend BioTrue, which has been developed to work like your own tears and presents very little risk of irritation.