Ed,
It was funny when I did the first ground running of my motor. When I was done I brought it down in the basement to clean it up. I figured well I'll give the windex a try and all it did was smeared and I even tried rubbing alcohol and it helped but still smeared. I had simple green just sitting here from my nitro buggy days. I tried it on a little spot and I didn't even have to add pressure, just wiped the rag across. The stuff works awesome on nitro buggies and would be even better for the nitro plane guys.