This stuff is on ebay at over £7 a throw. It is recommended that you use it with every fill up. Anyone any experience with it?
Can’t speak for that one but I give the old SS (and my old mini) a squirt of this before winter then run engine for a bit. Touch wood they start first time. Bottle says same about using every fill up. I don’t unless they’re going to stand for a few months. https://www.frost.co.uk/ethomix-corrosion-inhibitor-additive-ethanol-protection.html
When I stripped the carbs on my CB750 sohc , (it hadn’t run since 1995) they had brown tarnish on all the internal surfaces, I put neat Redex fuel system cleaner on it and scrubbed with a toothbrush , it didn’t even begin to remove the staining, at this point I wrote Redex off as snake oil, a quick blast with aerosol carb cleaner immediately removed the tarnish, modern fuels have detergents in them, I believe that at least on carburated engines they are a waste of time, whether fuel injectors are cleaned by any of these additives I don’t know, but again modern fuels contain detergent, if your reason for adding it is for storage you’ll need fuel stabiliser not cleaner.
I have used redex, normally when I've just bought a bike or car so unsure of it's history in regards to internal cleaning, I've used sea foam on an old mechanical muscle car. I don't honestly know if either works as I think they should do, but it's more as a pacifier and habit than anything else I tend to use them once at the beginning and then never again. Most U.K. modern fuels are upto the job. Most of the time I put fuel in and just drive.
