Can we use other type of brush? I don't think we have any available toothbrush at home.
Well, either you can wait until your current toothbrush is worn out and not fit to brush teeth with anymore. Then you can use it to brush off paint instead.
If you use Simple Green I have found that you can use softer brushes than a toothbrush. For example an older paintbrush that's too old for painting with worked fine to remove most of the paint with.