We have found during product testing that a wet towel or wet paper towel are sufficient to remove any Yoobi dry erase marker residue.

Please note that a white board cleaner and/or alcohol can also be used if needed.

If for any reason that does not work in your case, please do let us know so that we can take the appropriate corrective action. 

We know little fingers can get prints on your Osmo reflector. To clean it, we recommend that you follow this advice on cleaning Apple products and peripherals:

https://support.apple.com/en-us/HT204172

To clean the pieces, gently wipe them with a damp cloth, being careful not to soak the cardboard. 

Other pieces can be gently wiped as well. Try not to let anything inside the movable pieces (in the Coding games).