These days I am on my own with a humble little beehive kiln and prepping my own enamels. Though it can be time consuming washing enamel is essential for translucent, as well as opaque enamels. It ensures a truer color and a better final product.
The added bonus is that the filtered material can be used for counter enamel. That will save you a few bucks. Who wouldn't love that?
This video from Art Jewelry magazine is a great step by step for anyone interested in learning how to wash, dry and store their enamels. I hope you find it helpful.