All you need to do is put the toy in a plastic bag and then pop it in the freezer for 12 hours beforehand. The cold temperature will help kill any nasties hiding in the toy.
Lisa says: “Wash at 60C to kill dust mites and any bacteria but if the care label says it can’t, you can put it in a freezer for 12 hours before washing on a gentler cycle.”
If you are worried about damaging the toy through frequent washing, you can put it in a pillowcase before putting it in your machine to protect it.
Lisa also advises that parents and guardians can wipe the toy in between washes with a damp cloth, to really stay on top of the hygiene.