I also switched to a trackball for ergonomic reasons. Not carpal tunnel, something with my thumb. I think ulnar and radial deviation (left and right movement from the wrist) aggravated it. Trackballs helped, as did physio.
When I worked slinging coffees, we used a specific coffee machine cleaning substance. You poured in these pill shaped bits and they'd absorb excess oil as they ground through the machine.
I have the Ploopy Classic trackball and the Trackpad. Both are top notch products. 3D prints are excellent.
The firmware is open-source so I was able to flash my own layout for my own workflow. It's QMK, used in mechanical keyboards. You don't need to touch the firmware if you don't have the inclination, it works out of the box.
There's a small community of modders that have done wild things to the hardware too.
Gildan makes a lot of their shirts in pretty bad sweatshops.
But if you're looking for t-shirts made somewhere more "ethical", prepare to literally pay 10x the price.
For my workout or dirty work shirts I go to thrift stores. There'll be lots of polyester/cotton blend shirts but probably still gonna be more than $3.