Pretty much any rimfire silencer is going to be good on a 22 bolt action, especially if you use sub sonic ammo. If you use regular ammo, you might not really notice that you have a silencer.
I have a dead air mask 22 and a banish 22. I like the dead air but the banish 22 is lighter and easier to clean since its full titanium. That being said, I've soaked the stainless mask baffles in CLR and had no issues, I just don't soak them as long as I would the titanium baffles. I think I soaked the stainless baffles like 45 minutes and was able to fairly easily get the build up off. The titanic baffles, I might soak overnight and not worry about it.
If I was getting a 22 silencer today, I'd get the TBAC takedown 22, I think its still one of th best out there, the dead air mask is also top notch but again, any 22 silencer is going to be fine on a bold action rifle, I wouldn't even hesitate to just get a sparrow and call it a day.