Nothing beats KORG's muslin swaddling cloths that they were handing out at Superbooth a few years ago, for cleaning those knobs and hard to get at clavier keyboards.

It was such a great bit of Superbooth swag that I went down the rabbit hole on Japanese swaddling cloths, muslin, and the like[1], and am now a convert to the muslin clan. I don't use anything else for swims these days, its that great. The fact that I can slick off the water with the same towel I use to keep my synths shiny is just sweet.

[1] - https://kongessloejd.com/en-at/collections/muslin-cloths-swa...