How do I clean the Qwiek.melody?

This article provides instructions on how to clean the Qwiek.melody.

You can remove dust with a dry soft cloth. Do not use any liquid cleaning agents for this.
Stains or dirt can be removed with a gentle, non-linting cloth and a mixture of water and dish soap. Under no circumstances should solvents such as thinner, turpentine, alcohol, acids, or corrosive substances be used.
Make sure that the plastic screen in front of the Qwiek.melody lens is also clean.

Attention: Always make sure to properly close the cabinet at the back of the Qwiek.melody to ensure that it remains sufficiently waterproof.