This may or may not help, and is more of a preventative step, but while riding HDs, a good friend of mine who is also an old bike builder swore by Marvel Mystery Oil. I got into the habit of adding 2 ounces to every third or fourth tank full of gas. He claimed that it kept dirt and debris from solidifying in the gas and sticking in the filter or in injectors (or floats on carbs). Again, his claim was instead it would break down and pass through the system.
I don't know how scientific this is, but I continue to use it regularly and have never had a problem. Then again, it could be snake oil and I've just been fortunate