WORTH IT

There is no such thing as a heat-proof cover. There are heat resistant covers of various stripes, but it's always advisable not to test those limits too much. Unfortunately, it's not always possible to let the bike cool down completely before covering it up. 
So what you get, with the best will in the world, is melted bits of cover on the pipes. Now some years ago, a gent at a filling station suggested the old armourers trick of using baby oil and the finest possible steel wool. This actually works, but requires elbow grease as well as baby oil, in fairly large quantities. 
I spent some time and energy on Sunday morning, de-gunging my pipes and getting bits of steel wool embedded under my nails (the gloves didn't last. Latex and oil don't mix well. We know this). But I got it all off, cleaned my nails as best I could and headed off for a well-deserved pub roast lunch. 
As I waited for my lunch, I watched a man carefully inspect my bike from every possible angle. Twice. He leaned, he crouched, he peered, he very nearly took out a magnifying glass. 
Some time later, once he'd found his party and also spotted my helmet, he complimented me on my beautifully keep bike. And every last piece of steel wool still under my nails, every twinge from wrist and elbow and shoulder? Worth it.