https://www.reddit.com/r/typewriters/comments/1www974/the_mecca/
Left to right: Nick Campano Jay Schweitzer, Scott Connors

https://www.reddit.com/r/typewriters/comments/1www974/the_mecca/
Left to right: Nick Campano Jay Schweitzer, Scott Connors

https://www.reddit.com/r/typewriters/comments/1m44es6/great_visit_to_gramercy_typewriter/
Left to right: Jay Schweitzer, Scott Connors, Nick Campano

The Gramercy mix: 1/3 409, 1/3 ammonia, 1/3 water.Like
Andy Morris reports that Jay Schweitzer of Grammercy Typewriter uses this cleaning formula for cleaning the exterior of typewriters to be applied to a soft cotton cloth and not directly on the machine.
Morris further suggests staying away from decals with this.
Second hand advice, but no reason to doubt it. https://www.facebook.com/groups/705152958470148/posts/1386689876983116