Were you not given a care sheet by the orthodontist? Give them a call and get advice direct.
You can get specific cleaners - would have thought orthodontist would sell them.
You also need to be careful which mouthwashes you use and how often.
Toothpastes the same with regard to use on the brace.
Given this is a 'medical' issue I don't want to list specifics we were told as it might not be the same for you.
Just give the orthodontist a call - reception/ nurse will be able to help and if you can't do that then call your own dentist.
Remember 2 of mine going through it - not great times
DC sounds like they are coping well.