Kitchen sponge rough side scratched phone - How hard on Mohs scale?

Feeling like a bit of an ***** today, picked up a bargain new LG G7 and the IMEI stick on the rear was practically welded on so in the end I tried to get the last remnants off using some warm soapy water and the rough side of a kitchen sponge.

Net result massive scratching on the rear of the phone. I just assumed the sponge would be softer than Gorilla glass 5, clearly I was wrong.

Anybody know how hard these sponges are on the Mohs scale vs GG5?

I don't think we've had anyone all that one before...
That would really bum you out, brand new phone and all!

I'm sure it varies depending on sponge design, but I did some digging and some sponges contain silicone carbide. Silicone carbide rates 9-9.5 on the Mohs scale, so it's very possible you had something rather abrasive.

Yep, I feel like a proper ***** such a stupid thing to do.

I’ve ordered an Oem replacement back cheap on eBay so May chance my arm further trying to fix it.