Three things:
1) Naptime mats need to be replaced at the daycare,if there are any,as well as cubbies,or other storage bins where overcoats and scarves would be stored (turn the daycare onto tip #3, below).
2)And secondly,if your couch cushions will unzip,take them out,wash the fabric part,and put the foam rubber part inside two huge lawn and leaf bags and leave them there for at least two weeks. Same thing for any pillows it would be safe to cover with garbage bags. As long as they cannot feed for two weeks, they will die out.
3) Go to your garden center at walmart or wherever and look for spray for aphids on roses. it contains the same pyrethrins for 2.99 as the 12.99 lice sprays. The pyrethrins are derived from chrysanthemums, so they are safe for use around the children. I washed coats, cushion covers,pillows, towels-you name it,with the Aphid spray and hot water,and rented a carpet cleaner and used the Aphid spray in the solution tank. Problem solved !
Go to your drug store and get the proper delousing supplies. You can't get rid of them with mayonnaise and other home remedies. Lice like clean hair even better than dirty hair, so you must use the proper shampoos to get rid of the lice. Then you have to delouse the house and clothes.
I agree that you may have to speak to the people at the daycare about the problem if there is continual re-infestation.
Sorry to be so blunt but unless you remove her from that particular daycare, you aren't going to get rid of them. It's not fair that she should be going through all this hassle when it's not her fault.
At the first sign of head lice, wash and condition hair, then work a fine metal comb through the wet hair. Rinse in 1 liter of water containing 2 drops of cajeput oil, 5 drops of tea tree oil and 4 drops of lemon oil.
If your daughter keeps bringing them home, you may want to make sure they aren't staying home. Wash her hair in Mayonaise every day, using a shower cap to keep it on, and once she stops having them, they won't transfer to her bed.
http://headlicecenter.com/head-lice-mayonnaise/
http://www.ehow.com/how_2322573_get-rid-lice-mayonnaise.html
Keep doing what you're doing but also contact the daycare provider. If you are following the directions on the lice killing chemicals and nit ridding on your granddaughter, the only thing that makes sense is that the daycare provider is not getting rid of the lice there. Either the group area is not being deloused properly or one of the other children is living in a home that isn't being deloused properly.
Ask me how I know. My daughter (now 34 and would be mortified to know I'm sharing this story) caught head lice three times during kindergarten. The third time she begged me to shave her head the way one of her classmate's mother did. I was at the school in a flash insisting my child would not return until that whole school was cleaned, and someone went out the classmate's home to help that mother eliminate the lice her son kept bringing to school.
A group of mothers contributed to a fund to buy that family enough supplies to properly delouse. It can be very expensive if the infestation is well entrenched. We knew the child's family didn't have the money to do the job properly.
It worked, my daughter never had head lice again. The little boy's family got some help, and the school was cleaned up. The young man was able to grow his hair to a normal length, poor kid.
The daycare provider needs to prove to you they have properly addressed the problem. Insist on seeing receipts from a pest control firm, and that they've identified the child who is bringing lice back because his/her home is not being deloused properly. And hopefully, if the family is on a very tight budget, you and the other families will be able to help them get the supplies they need to take care of the problem.
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