A while ago when i did it had pretty good luck with a small stuby flat head screw driver,while holding the hose at the same time would insert the flat head in the gap of the clamp and push it back,at the same time would twist and pull the hose off gently&slowly remove the hose cause the BOV is fragile,worked for me.cause originally the clamp was facing against the firewall for some reason so you dont remove it i guess from the factory.