I've been watching Larry at Ammo NYC on YouTube for a while now and wondered if anyone has used any of his products. They're not cheap and the postage from the US is high but they look like they give great results.
I have a few of those myself and have used them for years and been pleased with the results on the whole.I may have one or two products from Autoglym
Pretty much what Billz said really, and the only way to find out is to try a few. Everyone seems to do some form of ceramic style coating these days, so can't see why you'd need to pay over the odds.Their are a lot of products out there that do the same job.