I have a problem with fuel going " off" in the float bowl of two bikes that are not being used at present. They are " for sale" since my accident. I usually start them every two weeks but this morning neither wanted to start until I drained the float bowl and added some fresh BP to the tank. The dained fuel smells strange. I heard of a product that supposedly addresses this issue. Super Cheap Auto chain stocks it but I don't know the product's name. Has anyone experience with this or similar products?