I need your help. I just started cutting 4 commercial lots in town. They alll have a lot of clover. I have mulch blades on the mower. I have to cut the clover up to 4 passes to make it look decent. I want to leave a lawn I am proud to say I cut it, but wondering if I am using thr right blades? And how often shoud I sharpen them? I want to but a sharpening machine, but at $800, don't want to spend this amount until I have income. Any idea? Thanks!