So what are you saying? Is it the squeegee off? or just some oil that went over it?
2 tea sp0ons per 4 Liter water / 4 per 8lt is the ratio you want. Normal sized tea sp0ons, not the tiny posh ones lol.
If it's something else then squeegee off (as in real oil!), try using a bit of sunflower oil, fairy liquid and Cif (bathroom cleaner with a bit of grit in it) to clean your tools.
I use it when I've worked on my car, best thing there is, almost as good as professional stuff that they use in garages. But ehm....that tip is useless if you don't mean 'oil' as in 'oil' haha