While choosing bananas you should look for yellow skins, with no spotting. You can ripen green bananas faster by placing in a paper bag with an apple. As the fruit turns a deeper brown, it is better suited to cooking and baking.
To retain the shape of your paintbrushes for a longer time, wrap them (while they are wet from cleaning) in newspaper and fold it shape the bristles and allow to dry. Try doing this after each cleaning.