Pitch that farmer wrench, good way to really skin some knuckles, and use the correct size 1" box end wrench or socket and breaker bar so you can get some decent leverage.
Make sure the area surrounding the valve is spotlessly clean using carb or brake cleaner and blow dry w/air. You may even need to use a small wire brush in the process as well. You DO NOT want crap falling back inside the housing while removing the valves.
You may have rap the end of the wrench with a hammer a bit while applying some pressure.
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