Rinse with water (a LOT of rinsing) until the water runs clear. It takes quite a bit of time. Be patient. Dry thoroughly.
Or
Safely dispose of the old pads and get these from Amazon:
https://www.amazon.com/MASME-Waste-Sponge-Epson-L6190/dp/B0BG1HDRHW/ref=sr_1_4?crid=3LEIE1DX98ETC&dib=eyJ2IjoiMSJ9.ycuvWUHdBt0zNyp71O-lLU0hvFdHI8S9nwbYwuEqSJzE46tmb6MRD10zvKB7O59Fw-oYStDmb6pXfkr2ONdVO-jhksYaBAG-4ifHG31gqzSqPhVc1qiwjgNhjzqVKpBCgzeV8sRgeQTPm-PN2lnaXdybhOk3aSNFNe75_-ZIfnUgRjeKS8hf40DcA-WMYpvCFHLkhsQqI5igqGt60YC8VE0DgJFUR5jH9ZJKuU1jDbc.c9u_y3MyJb0INTFUk4_FSkqeLXFIZtIgCqQvmSaj71I&dib_tag=se&keywords=epson+et+2750+ink+pad&qid=1726972804&sprefix=epson+et+2750%2Caps%2C90&sr=8-4