Does anyone know what method was used to clean this W4000 pad in this wetsanding video. skip to 3:44 in the video. I'm going to start using this pad in a couple of days and I want to know how to effectively clean it.
link: http://youtube.com/watch?v=38L3UQxXuQA
TIA
link: http://youtube.com/watch?v=38L3UQxXuQA
TIA

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