I'd like to know what is good for lubricating the nuts and bolts that hold the blades on a commercial rider. I've found that different conditions sometimes cause them to almost be frozen on. I spent an hour last night with a breaker bar and a 4 foot long pipe trying to get them off. Sometimes they come off so easy and sometimes it's like they are welded on. I've tried WD40 and other types of spray on lithium grease. What does everyone use and what works best.