some advice...

Listen to me. What you are doing is not good for you. It's unhealthy. Do you understand?
There's no reason to use the level of effort you are using, and, if there is, something is really wrong with you. What you're doing can only make it worse.

It should not sound, when you do what you are doing, like you are sanding down a burl, or steel-wool scrubbing burnt lasagna off the bottom of a pan.
Scrubbing at all, I think, should be avoided.

Be more gentle, will you? Parts of you will thank other parts of you.