This test demonstrates that not all penetrating oils are equal. In fact, the see-through plastic/rusty bolt test shows which ones actually penetrate and which ones don’t. Which penetrating fluid is best? In this showdown, Brake Fluid, Seafoam Deep Creep, Fluid Film, BG In-Force, WD-40 Rust Specialist, CRC Knock’er Loose. Consider selecting the bell in the upper right hand corner to get notified of future videos. Deep Creep won the competition with CRC Knock-er Loose coming in a close 2nd.