Nikwax Visor Proof, £5.99

Tested by Martin Fitz-Gibbons for two years Helps rain bead off a visor. Spray a couple of squirts onto a dry visor, then polish in. You really notice the difference – rain really does streak off instantly, either straight down the visor if your bike has a tall screen, or running out to either side of the lid if you’re on a naked bike. At first it’s fantastic, but frustration sets in about half an hour later when it’s washed off. Great while it lasts. Quality ★★★★★ Value ★★★★★ www.nikwax.com