Yes since i blasted all the years of muck off i've been told that you have to be very careful where you blast.
I was careful not to hit the "delicate bits" head on, i did them at an angle and only for a second or so.
The bike came up like new, apart from the usual scratches and chips. I've had the gear shifters replaced by(excuse my lack of mechanical knowledge please)those things that sit on top of the bars, like the old 3 speed bikes had. The mechanic said the original shifters had corroded and would cost about £100 to buy and fit. He's put me a couple of "chunky(ish)" tyres on and stopped the slight wobble on the back wheel, so my old faithful has been restored/saved and i'm buying a cycle computer to record all the long journeys i'll hopefully be making over the Summer and beyond.
It's cost me £65, a lot cheaper than buying a replacement, and as i have many happy memories of my Carrera i feel like i'm renewing old aquaintances!