shockingly, the dd's bath toys are now sufficiently mouldy as to be giving off a rather musty smell. the foam letters are currently bathing in Milton, but thus far they're not looking good. is there anything else i can try?
No good to you now, but for new ones, rinse well after each bath and once a fortnight or so, soak in Milton. Dry them on a rack or similar ( I've old bun cooling trays for that) so they don't sit in damp conditions.