Guinea pigs are clean animals and they like to be kept this way. Guinea pigs that have short hair do not need to have a bath. However long haired guinea pigs do require more maintenance and a bath will be part of this regime.
If the weather is hot you may choose to give your guinea pig a bath to help keep cool.
What you will need:
Bowl for them to have their bath
shampoo or skin/coat treatment ( depending on your reason for a bath)
Comb and sissors on hand