Any idea what this is and how to clean it?

[SynthWizard]

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Any idea what this is and how to clean it?

<table> <tr><td> <a href="https://www.reddit.com/r/synthesizers/comments/d70lyj/any_idea_what_this_is_and_how_to_clean_it/"> <img src="https://b.thumbs.redditmedia.com/7tK7DWKSjRUaZ06pqWWFjAfezd4rfpnO5o8A373Kp9Y.jpg" alt="Any idea what this is and how to clean it?" title="Any idea what this is and how to clean it?" /> </a> </td><td> submitted by <a href="https://www.reddit.com/user/9theninja"> /u/9theninja </a> <br/> <span><a href="https://i.redd.it/zcu1f2526tn31.jpg">[link]</a></span> <span><a href="https://www.reddit.com/r/synthesizers/comments/d70lyj/any_idea_what_this_is_and_how_to_clean_it/">[comments]</a></span> </td></tr></table>