🚀 go-pugleaf

I have always found that really careful cleaning has fixed these problems.
I have never used any chemical cleaning agents.
The ball itself can get gooie, a gentle but firm rub on my trouser legs
gets the offending gunk off (sometimes it is quite invisible).
The little roller wheels on which the ball engages need even more care.
They can get goop on them, I find a pointed pencil eraser does the trick,
but be careful to get all the residue out and not to scratch them.  If
trouble persist, then I take the little devil to pieces until I get the
rollers out with any fluff that has twined around them.

If jam or coffee foil the mouse buttons, after disassembling and separating
electronic components, warm water with a tiny bit of detergent works
quickly.

Of course none of this is other than obvious, but I do recommend a really
close look under a bright light.

The only irreparable damage that I have ever seen was down to some wild
skewing by furious hackers using pointed metal objects.

I have spares and would be happy to repair, but postage to Europe will I am
sure make local help preferable.