Gotta agree chrome covers are much easier. Try Naval Jelly if you really want to remove the rust. The problem is that most chemicals that will remove the rust will also remove the paint on the heads. Use sparingly and a little at a time until its all gone. Remember it'll probably show back up in a couple of months.
Jim in Italy
4"Extended Jaybrake Forward Controls
Wide Wishbone Girder Front End
Super E Carb w/Forcewinder Air Cleaner
Holographic Metal Flake Paint Job
Four Piston Jaybrake Calipers front & back
16" Carlini Apes
forget the oven cleaner dude! The guy I bought my bike from read about using it on a forum and lets just say the result gave me a great bargaining point to bring the price down... looked like $&!%. I used a combination of Brasso to get the heaviest crud down then hours with Never-Dull. Redd-Trigger has a good suggestion. Toothepast and a good stiff bush. Its a mild abrassive and will take down the surface rust (with a lot of work... be patient) and it wont have bleed over affects on the heads. Get as much off as you can. Coat them with a protectant and put caps on them.
"I've come to like the taste of bugs over the years, but the hairy ones are still hard to swallow"! (me)
"...for those who man the battle line, the bugle whispers low, and freedom has a taste and price the protected never know..." (unknown)
"...The definition of tact is the ability to tell someone to go to hell and make them look forward to the trip..." (1SG Robert J. Nolan)