I'm setting up my old kit at my wife's farm, it's a 2 vessel stainless steel HERMS. I had a look at it today and there's rust on some of the parts, the kettle is brown from many previous brews, everything is a bit dirty. Everything is stainless steel, is there a way to clean this which doesn't involve scrubbing? I'm getting some other SS equipment (recently got a new SS fermenter) so would be good to know hwo to clean that. The pamphlet which came with my fermenter said not to use oxy cleaners. I have a grainfather and used the Grainfather cleaner, it didn't seem to work. Stains would remain and if I scrubbed them afterwards they wouldn't come off easily, so would be good to use a generic SS cleaner on that too.