Is there a good method/ additive to clean out carborator jets without disembling the carborators on a bike?

I have a '02 Triumph Bonneville America that has been sitting for a while. After I replace the fuel with fresh gas, I'm thinking about adding either a small amount of Marvel Mystery Oil or STP carborator treatment to help clean out the pilot jets. Is this a bad idea? Is there a better way to go about this without tearing my carborators apart?