Why should you have to get rid of them just because of lice? would you get rid of your kid if they had head lice? No, you just get rid of the lice. It is quite simple really, just keep in mind you absolutely can not use most products intended for other animals (I'm specifically referring to flea shampoo for dogs). Also most shampoo's and sprays marketed towards guinea pigs are useless and very dangerous.
Your best bet would be to get your hands on some ivermectin like bpatters suggested originally. You will need to use it topically (applied to the skin, which is normally done on the bald spots behind the ears), you only will need a very small amount as it is easy to overdose them and that can have devastating consequences.
So get some ivermectin, then when you have it if you post the concentration which should be written on the bottle and your guinea pigs weights then we can help you calculate the correct dosage. You will need a 1ml syringe (no needle) to measure the amount when it comes to giving it to them.
You ust have to understand that children do not get a choice in keeping or giving up pets. It is a parents choice. If you read this closely, you can see the panic in a childs voice as this child wants to fix the pigs and keep them, and affraid someone else will over ride this choice and give them up. Not all parents are all that understanding to these things. It is not a childs fault what their parents choos to do. I'm not yelling or anything, really, I have seen to many adults, get after a child for what their parent does and treats them like its their fault and they are bad pet owners. These children stop looking for help because of how they are treated. Then their animals don't get the help they needed.
I was one of those childrern a long time ago that had parents that did not understand simple things as this. I understand not letting your parent know about a problem for fear that they will get rid of your pet, so you try and fix it yourself. And I understand what its like to finally have to tell them when you can't fix it and you fear the worst, but your trying to do the right thing..... Thankfully for me, there was no internet when I was child to have strangers tell me I was bad for what my parents do. I probly would have commited suicide with the low selfasteem I had.... A forum will never know if it causes such acts because we just don't hear from that person again......
My point is, as adults, we have a responsibility to children to understand who we are talking to, and that they don't get to make the choices in their lives. Its our responsibility to understand the fear of a child maybe losing their pet if they do the right thing, but choosing to do the right thing anyway. It is up to us to decide that we should care about the child, and understand that this is not the childs choice and children are more and more commiting suicide over this wonderful world wide web. So I am asking that we understand children. And that we do not tell them they are bad for things that are not up to them. This isn't realy targeted to you, Soecara, so much as I just want it understood what exactly I am talking about. Sorry, very protective over children and tired of seeing them hurt themselves over people wanting to quickly judge, rather then take the time to understand. Judging is much easier, but understanding saves lives and makes us all better people.... and when we are better people, we are also better pet owners.....
No yelling, no fighting, as its hard to tell through written words. Only gently saying how I feel.... Blessed Be...