Never siezed. I cleaned it at 50k & will again at 100k when I change the valve cover gasket. The valve cover is aluminum, unknown what the pcv metal is. Toyota 2.4L 2AZ-FE engine
It is a vent and there shouldn’t be enough pressure inside to blow it out. If pressure builds up enough with the anti-seize on the valve you have bigger compression problems. Sit it back in there and let it vent. You can clean them with alcohol or electronics cleaner like the MAF sensor instead of buying a new one, I know they are cheap but sounds like you do good work and I’ve cleaned my sensors for years on my vehicles that I worked on.
