I would not risk that. I am sure they cannot be that dirty! Surely you can wait until summer?Thank you v much! I know know what to do in Summer/Spring! Would this be okay: bringing them to a friends house who has piggies, bathing them indoors and waiting until their fur dries to bring them back outdoors?
Second the baby shampoo it wrecks my hair. ..let alone what it would do to piggiesThis link will tell you how to bath piggies,
I would not use baby shampoo as it is too harsh. @helen105281 knows a good shampoo for pigs that is free of essential oils so will not cause an allergic reaction.
It is too cold to bath your girls now though as they live outside.