If you put them in the sink pop a small towel in the sink this way they have something to grip to less frightening for them. I have used dog shampoo and teatree conditioner works well, the latter is ment to keep bugs away?
Like OO says towel dry and blow dry untill dry they do enjoy it the blow dry. Have fun I just use one hand under the breast and between the legs to support them leaving the other to wash, lower gently into the water just do the head with a damp flannel no shampoo.