Here is the one OP has. The model might be a little different but they are made by the same company and the only difference I could spot was the logo on the top.

I use something like this. You can get them at Menards for pretty cheap, too.

I’ve also used the under side of another pan in a pinch.

People have also used drywall trowels and wall paper scrapers before, but that’s expensive. Looks cool though.

I’m not sure any spatula will be up to the job.