Made a blue spraying Lanotec all under the car and engine bay before my first ever beach run. It was recommended by Roothy from that magazine. I knew no better. Bloody sand stuck to everything, I was so p!seed off. Stopped buying that mag after that as I realised it wasn't advise he gave it was selling an advertisers product. I have used a masojet on the garden hose for years to clean inside the chassis rails, very effective. Use masojet and gerni to clean sand or mud. Works for me.