You can clean your Piper Noble bag and liner with a soft cloth and water. For heavier soiled areas you may use a pea size amount of mild liquid soap. Always test a small, inconspicuous area first. For the clear windows, you may use a damp Magic Eraser to remove scuffs or marks, using caution not to get residue from the eraser on the vegan leather.
Always store your Piper Noble bag in it's duster bag when not in use to keep it looking its best.