I have a new hedge trimmer that I just got last week. I used them once and put them away until today. I got to the job site and got everything out of the truck and started up the hedge trimmer and the blades were rusted together. They were stuck so much that the motor wouldn't brake it loose, it just bogged the motor down. So needless to say... I was done at the job early today. What should I put on the blades to stop it from rusting like that? I would think WD or some sort of "oil" spray. However, I don't want the spray to damage the plants I'm trimming.