We recommend isopropyl alcohol and a non abrasive microfiber cloth for cleaning the mirrored surfaces. Ethanol is also fine, even household glass cleaner is fine. Avoid harsh chemicals. The most important thing is to be sure the cloth is non abrasive and clean. This might be overkill, but we use https://www.gesswein.com/p-9480-selvyt-professional-cloth.aspx
Please note, the bottom mirror is inaccessible. The surface that you rest your model on is clear polycarbonate. This can also be cleaned in the same manner.