Yes, and I've done very well with them. They're tight enough feathered that I would never consider blow drying them for showing. I blow dry them some, when I'm not showing them, but not for a show.
Dawn Blue dish liquid cleans good, and is gentle, however the pH is a bit alkaline. The vinegar water removes any soap residue leaving the feathers sparkling clean, and restores the pH balance to the skin/feathers. The final rinse removes the vinegar. The final rinse is very important, so...
One more thing I found helpful, I usually take a pair of surgical type gloves. While many just reach in, and grab the soiled pine shavings, then go wash their hands, I prefer to put on a surgical type glove, then remove it after I take out the soiled shavings.
No, normally you may not wash them there, nor do you want to. They won't have warmish water, and spa time is to be a comfortable experience for the bird. I forgot to mention, you take small binder clips, 2 per bird, and solo cups, at least 2 per cage, and pine shavings.
Back to the bottles...
I am not a judge, and unless it's an exceptional bird, even judges won't judge from a picture. If it's a 4-H project, the kids will be asked to hold their birds properly to show them. If you're showing as an adult, the judges will open the cage, take out the bird, examine it, then return it to...
I hate to assume, so we'll start with your stock. Did you buy SOP eggs, or stock to begin with? If not, that's where you will want to start, whether they are up to the show standards, or not.
You might want to start by attending at least 1 APA sanctioned show. This will give you more of an...