I spray my budgies everyday with a spray bottle. I also have some bathing solution that I use about three times a week. You just need to make sure that it's a good distance away from them so it doesn't get into their eyes.
Actual sink or shower baths don't appeal to my budgies at the moment. Hopefully during the summer months, they will be more inclined to give it a try!
How often do your budgies get a bath?
Do you let them bath themselves or do you spray them with a bottle?
We usually have a bath available for them most everyday, that way they can take it when they want. We also use the spay bottle on pud, jojo and frosty they love it.
Jojo and pickles love bath time http://www.youtube.com/watch?v=GbSFbZj-pJ4
My birds like the salad way to bathe. I once left some wet greens in the salad spinner and my boys had a field day. They have their bath and can eat it too. This is about 3x per week in the winter and up to 7 in the summer, but they do not always take the bath.