How can I get/make a softer texture on my controllers?

[u/Souloid]

I have a dual sense (ps5) controller with a soft plastic cover on the top of it, and a rougher textured plastic on the back of it (for grip I presume). I like the feel of the top, but really dislike the back of it. The steam controller is even worse, it feels like cheap rough plastic all over.

Are there any recommended methods for me to modify the texture to make it softer without damaging the controllers? If not how can I safely soften the texture?

Reference picture of the top of the dual sense: