That certainly is a creative idea! I’ve never heard of it! It’s worth a try. I don’t think it would work (because the flakes might be too small to get sucked up), but it can’t hurt to see how it goes! It could be a pleasant surprise.
Here are some in-house tips for what to do if you have flakes in your locks and want to get them out.
To rid of dandruff, you should use whatever shampoo works best. If you had a favorite shampoo from before your had locks, try that and see if it helps.
If that doesn’t work, here is some advice for cutting down dry scalp, which from my observation, seems to be the #1 cause of dandruff.