Firstly, bikes are meant to ride, not sit. The worst thing you can do to a bike is let it sit.
Secondly, Ethanol is your friend.
Run 10% mixed ethanol (sometimes called “winter gas”, available year round all over the place). All gas vehicle sold in North America can run it without issue (it is often the only gas available in the winter where the temps drop below -20 on a regular basis).
Ethanol is a nasty solvent (it dissolves gas lines at higher mix ratios, hence why you can’t put E85 in a regular car). But it also dissolves the crud that might build up in carbs. Running a couple tanks of it will do wonders for slightly gunky carbs.
But frankly, that should never be an issue. Just don’t let the bike sit with gas in the carbs long enough for them to gunk up. If the bike is going to sit for three weeks or more, put some fuel stabilizer in it and make sure it makes its way down to the carb. The only motorcycles I’ve ever heard of needing carbs cleaned are ones that sat without fuel stabilizer. In two years of having three bikes in my family, all of them carb’d until just recently, never had an issue with a carb.