Loads of these types of liquid on the market & the prices vary. To my mind autoglym performed well & didn't cost a bomb, the green gel type. I was very impressed a couple of years ago when I came across a bottle of this lurking in my shed, it had all but dried up, so me being me, I revived the gel by adding a wee splash of white spirit, then a lot of shaking. Worked a treat on my diesel hack.
Funnily enough, I cannot for the life of me remember purchasing this magic liquid.
Funnily enough, I cannot for the life of me remember purchasing this magic liquid.