Snapmaker Plate cleaning

[Gregg]

I stopped by the space before work this morning to kick off a print. The plate on Snapmaker 2 has a substance (maybe glue) on it that I was not able to clean off with rubbing alcohol or the plastic scraper. I am new to 3d printing and wanted to ask here before I tried anything else to clean off that plate.

I swapped it out with a spare and started my print. If someone can provide some advice on how to safely clean up that plate, I can work on it when I pick up my print after work today.
@FabLab
Thanks

[Gregg]

I had some time to search the web and found this guid on the Snapmaker Wiki.
How to clean your PEI steel sheet | Snapmaker Wiki

I will try those steps at lunch.

[Gregg]

I scrubbed that plate with soap, water and a but you can still see the stain in the plate.

It is difficult to see in the pictures. I am not sure if that will cause adhesion issues or not.