Cleaning B Free bottles

[Tartan]

Hi there
Was wondering if I need to buy a special bottle brush to clean the B Free bottles with the extra valve or if i can just use a regular brush. B2B is apparently out of stock for the next few months so wondering whether to get hold of one from abroad or just buy a regular brush
Thanks

 

[karmah1]

I have these bottles and the brush. The B free brush looks like other bottle brushes so I'm sure they will do. There is nothing special about it.