Notion's development kit is pretty durable. It's made of ultrastrong plastic, normally used on medical devices, to ensure your development kit lasts. Do not get Notion wet, it's not water-resistant, it's not waterproof.
You may clean Notion's external surfaces with a damp cloth or alcohol wipe. The electrodes can be cleaned with the same type of cloth or wipe. The same cleaning wipe can be used for the outside of the hard case.
The inside of your hardcase may be vacuumed if you get some crumbs in it.