It's Scotch Guard. I use SG on my Vintage WWs. Doesn't seem to help keep them whiter/cleaner much longer, but does make it faster/easier to clean them the next time. Brake dust and road grime seems to come off more easily. After cleaning I spray the SG on a paper towel and wipe it onto the WW. Quick'n simple.I think it was liquid pledge after cleaning but can't remember for sure?