vinegar

Anyone have trouble with Sioux Chief Mini Arresters for water hammer? I poured vinegar into a failed Sioux Chief Mini Arrestor used on a washing machine, let it soak for 90 minutes or so, rinsed it thoroughly, and replaced. The Arrestor is now working perfectly. I'm not sure if the fix is due...

While I am told that descaling my unit yearly is important, I am not sure which descaler to use. Are the store bought descalers any better or different than white vinegar alone. Thanks.