Step 6: The most important step: Give it a nice relaxing bath.
The entire process of cutting, scraping, filing and sanding will leave the mouse pad in an absolute mess of metal dust and debris.
In order keep the Teflon topcoat in good shape and to keep from ruining the entire project....
We must wash!
Just rinse all the the big metal filing off of the board first, then emerge the whole thing down into soapy water. Give it a quick rinse again then towel dry.