[Healeys] Decarbonizing technique?

[Guy R Day]

Trickling a pint of water through the carb(s) of a hot engine revving around 
3000 rpm was one of the things done in the older automotive times although I 
have not heard of using ATF or brake fluid.  I can see no reason why it 
shouldn't work, but it may be rather smoky!  I was cautioned against the 
process by a guy who explained that it can remove carbon build up in chunks 
which can cause damage to the valves as they attempt to pass through.  I 
suppose if it was done every 6 months or so you wouldn't get enough build up 
to create chunks....
During war years and in the 50's it was used on a regular basis as it was 
meant to keep an engine cool and water injection kits were sold for a 
similar purpose - but I never played with them.

Guy R Day