A blow dryer is ok, ONLY IF:
It's set on a very light setting, NOT hot/high, but the lowest setting which has lukish warm air, the setting also which the air is not coming out forcefully, but very lightly, mild, slow. The lukish warm air should not have too much coolness to it either, or the bird could get sick from catching a chill from the cool air when wet. But the air should be a comfortable warm; just a little bit warm, right above cool.
You hold the blow dryer AN ARMS LENGTH AWAY from the bird WITH ALSO FANNING YOUR FINGERS IN FRONT OF THE AIRFLOW (YOUR HAND BETWEEN THE BLOW DRYER AND THE BIRD)
You should bathe the bird early in the morning to give them time to dry out during the day, never put them to bed still wet. Leave them out on perch tree stand to dry out during the day.
The blowdryer in the above fashion can be used to help dry the bird most of the way, but not to where they're bone dry. Let them air dry out the rest of the way. This is because you want to be careful with their skin. You're just using the blow dryer, mainly, to get rid of some excess, to help them dry "some" of the way.
AND - if the bird ever should catch a chill when they're wet from bathing (you'll see them shivering), you need to warm them up real quick, or they could get sick. You warm them up from this by going into a room with them, close the door, plug in a small electric heater to gently and slowly heat up the room. DO NOT PUT THIS AIR FLOW FROM THE HEATER ON THE BIRD. Just let it warm up the room with the bird in the room, until you see the bird has stopped shivering and is back to normal. You have to be especially careful of this in winter time. Do not let your bird catch a chill when wet. In winter make sure your home is not cold when you bathe them.
When you bathe a bird every three to four weeks, you really have to pretty much saturate them down to their skin. BUT GENTLY. The parrot specialty shop where I bought my bird says the best and easiest way to bathe a bird is put them in the bathtub, and using those shower heads that you can take down, that are on a hose, set it to the gentle spray, and spray them down. They can get out of the sink, but they can't get out of the bathtub. The water should be luke warm, not cold, but with just a little bit of cool in it, and some warmth in it. Again, when describing the warmth part, this is a gentle, comfortable warm; not too warm, and not hot. Put a CLEAN wash cloth under their feet for them to step on, while doing this, which is the way the bottom of their feet get clean. Any wash cloth used for this, ALWAYS RINSE IN CLEAN WATER FIRST, GETTING ANY DETERGENT OR BLEACH RESIDUE OUT OF IT, WHICH IS LEFT OVER FROM MACHINE WASHING.
Indoor born and raised birds don't know what bathing is, and learn to love it, and know it's what they need, and how good it feels to their skin, just like outdoor born and raised birds. They will like it and begin to play - you will see signs of them liking the baths, like lifing their wings, and things like that. And you will eventually see the bird trying to take their own bath in their water bowl in their cage, which is too cute and funny, and it's another sign they're learning about baths and liking it - and taking a bath in their water bowl is also a sign that it's time to bathe them. Mine does all these cute kinds of things when bathing, and tries to also take a bath in his bowl.
And at times, he will perch on my arm, over the bathtub, while I spray him gently like that, with the showerhead, and he lifts his wings and has the cutest look in his eyes. You will grow to learn the look in your birds eyes, facial expressions, and body language, as to whether they're happy, and even as to whether they're stressed. When I mist him with a water spray bottle, he lifts up his wings and holds them up, and makes cute joyful noises. He loves it, and starts playing. Misting is a nice refresher type, but misting can not necessarily saturate through to the skin, which is what is needed. Misting is more of a playful interaction time for the bird.
The reason(s) for rinsing down (bathing) your bird is so that the oils in their skin doesn't dry out - or else they can get skin irritations - similar to Eczema. You also bathe them because of bird dust. And these reasons are why you see outside birds bathe on their own too, splashing around in puddles of water they find or in bird baths people provide outside for birds to bathe in. If you sat around in a cage all day, you'd get dusty and dirty too LOL. Granted, you also have to have your bird out of the cage, let them play, get exercise, and interact with them, for at least two hours a day as well; but the bathing also cuts down on bird dust. Bird dust is a normal thing for birds.
I hope the lady who washes her bird with soap three times a week and blow drys him, comes back and reads this post for educational purposes. And three times a week, that is just too much, un-needed, and is probably stressful for the bird. Soap, I know, is definately stressful for the bird. If this is being done with her bird, that bird is suffering, and I'm worried about that bird. Goodness, what if the soap is getting in the poor birds eyes too!!!!!!!
I want to know, where ever did she get the idea to use soap to bathe birds!?!?!? That needs to be stopped right away.