WVBill - I just pressure washed it (on the highest pressure setting with a 2100 PSI pressure washer) so it was pretty much down to bare metal and let it dry overnight before spraying on 1 can of Slip Plate. It's not a real thick coat, so next time I'll buy the quart can and brush it on. I forgot to buff it up first and mowed the grass, which is damp and lush this time of year, and it still looks pretty clean underneath except for a couple of spots that always seem to build up the worst. I didn't have time to try hosing it off with a garden hose to see how it cleans up. The next time I mow, which won't be long this time of year, I'll try that.
I was in TSC Saturday and noticed they have 2 different brands now (or the company changed their name). They had some cans of Slip Plate and some cans of EZ Slide. The cans are the same green and white as if they wanted to keep people from noticing the difference. I bought 1 can of EZ Slide, since I already have 2 cans of Slip Plate left, and plan to spray my 6' mower deck using Slip Plate on 2/3rds of it and EZ Slide on the other 1/3rd and see how they compare.