Don't know if this will help, but here goes:
I just use a disposable razor - but you have to be reeeallllyyy careful not to cut the fibers, kwim?
I always wash sweaters in a hand wash with a mild detergent - and only a little of that - if absolutely necessary. Otherwise, I spot clean and hang outside to freshen (yes, even in winter).
Because we live in the frozen North, and camp at least twice a month, we keep our sweaters available all year long. We use lavender, cedar, and closet moth-traps to keep the moths from eating our stash.
Parenting two active, wonderful boys
This is your world. Shape it or someone else will. -Gary Lew