Years sgo at Wellesbourne market, my missus pointed out a bloke selling carpet spotter,
he poured used engine oil on a carpet tile, and sprayed it and simply wiped off!!! amazing loads of mugs bought
some, my missus said thats good stuff.
My reply was, no he's demonstrating just how good the gaurd on the tile is.
A company i subbed to used to advise us to soak kitchen roll in the solvent based silicon gaurd we sold,
when dried out you could run it under the customers tap and it wouldn't get wet, a very good sales gimmick.