What you discovered is what can happen when ethanol is used in older carburetors. The gel substance in the carburetor is the corrosive reaction between carburetor parts made from aluminum (alloy, pot metal), ethyl alcohol, water and electricity. The gel dries quick to leave a white powdery crust of corroded aluminum. Aluminum corrosion is typically found in carburetors that pre-date ethanol gasolines coming on the scene (2003 or older engines is a common rule of thumb). Remember that Sea Foam in fuel is always working as a fuel system lubricant and to treat carburetors, intakes and cylinder cavities (Sea Foam Spray) with when storing seasonal engines. And, avoid leaving ethanol in a fuel system.