If there was something in the float bowl then it would be more likely to be sooked up by the main jet than the idle jet, simply coz there's more flow going through it so more eay to pick up larger bits of crud.
D'oh. I just had a look at Ishop's Microfiches - I had forgotten if you are going to block a main jet, this is the carb to do it on - that isn't just a drain screw - remove it carefully - the jet is in behind it! (as is a small washer to seal the plug)
Probably worth a still doing a reverse flush on the vertical pipe, just in case crud has got that far.
If the carb cleaner removes paint I'd also get a load of kitchen towels to catch what's still in the bowl before you undo the drain screws!
I'm off to scrape the last of the antifoul off mine, depending how well it goes I might not be back here 'till tomorrow.....