Sounds like Mother's Back to Black. I used it and initially thought it worked like a charm, but a few days later I could still see some white residue on the plastic. I suppose I should take a toothbrush too it next time I try using it. It certainly smells nice though.

You probably won't believe this, but last time this came up there were several people that vouched for using peanut butter of all things, enough that I actually believe them. Only problem is you then have to clean off the peanut butter, which means you probably need to re-wax after the wash, which means you'll probably end up with wax on the plastic again...

Brent