Aussie mums! LICE!!!!

So my 7.5yr old has got lice! iiick! This is his first time and mine as a mum (I used to get lice as a small child 20+ years ago lol but haven't had to deal with them as the grown up). What is the best lice treatments in Australia? Do the more body friendly/less toxic treatments actually work? Just cut his hair at home (easy he has an undercut and long on top which was all overgrown), gunna take to hubbies and my own undercuts later too before putting treatmemt on and combing. Already notified his school which is 100% were he got it, because he only leaves the house for school, his 2yr old sister only leaves the house for school pick up drop offs, I only leave the house for the same thing, as well as grocery shopping once a week by myself, and their dad only goes to work everyday which is low risk for getting lice in a tradie workplace, we haven't had guests in months, all thanks to covid-19, so 🤷‍♀️. Going to wash everything! As much stuff as I can, we use 60°c (140°F) wash as standard in our front loader, is this enough or should I do 90°C (194°F)? Top tips for treating lice appreciated! Thanks everyone!