I searched here and on the internets and got tons of "try this" but only one "I did this and it worked." to get rid of this white corrosion in my carb bowl and plunger chamber. Before I use toilet bowl cleaner on this, does anyone know the best possible way to get this white corrosion off permanently? It sat in Berrymans Carb Cleaner for 2 days and the outside is clean and purty but this white stuff remains. 65 SD40 single bbl Aisan.