OK, I missed that. If you have a spare mouse that is step 2 after "is the mouseball dirty". Actually, it's step 1 because step 0 is "wait, your mouse still has a rollerball?"
OK, I missed that. If you have a spare mouse that is step 2 after "is the mouseball dirty". Actually, it's step 1 because step 0 is "wait, your mouse still has a rollerball?"