Was having a little slowness in my 64' 230SL starting. Felt maybe not getting enough cold start fuel in to manifold.Took the cold start valve off to check if everything seemed ok. Actuated the solenoid while trying to manually blow through the valve. Seemed restricted but really don't know. Any recommendations on cleaning that little filter in there? Normally I'd try to blow some carb or break cleaner into the filter but wanted to check for other opinions.