I have a Teacup Maltese who is afraid too. I try to get her as relaxed as I can. Sometimes giving your dog a treat mid-bath calms them. With bathing you just have to keep doing it a lot so they get used to it.
There are many products available for fearful dogs in need of a bath. Bath powder (also known as a dry bath or dry shower) is the most readily available.
There are several "dry shampoo's" for pets on the market, both spray and power. You can spray the solution on a cloth and wipe down your dog or use the powder (though it's a little messy).