Back in the day, I was maintaining 3 tractors, 2 transfers, and 4 puddle jumpers ( intl 4700), all which where diesels. I used a product called invisible glove. Worked great
Go into an auto parts store and ask them if they have this. The looks they give you are hilarious, especially when they say there's never been anything made like that. I explained to the guys behind the counter what it did and they said "that sounds like a great idea!"
