I have a small spray bottle (old kids tangle free bottle) with a mixture of water, conditioner, tea tree oil and eucalyptus oil I used this as a preventor and for quick comb throughs.
I also have a comb in the shower and when I condition the girls hair I go through it...I also do it to my own as a precaution...I have occasionally found one in my hair.
I find that once they are in school/daycare it is an on going thing.
Checking, using a preventor is the only way to keep away.
You cannot just treat them get rid of it and think they will never come back...unfortunately...especially when they are in school and there are parents who don't treat their kids.