I started a thread last week over clumping fertilizer but this week I have closeup pictures of this phenomena. This spreader was cleaned a few hours before this picture, It was completely dry outside, the fertilizer was dry. After an hour or so of spreading this black tarry gook starts forming on the inside of the spreader, it has the consistancy of silly putty. This is Lesco Elite, Not a cheap product by far....What is the problem here??? What is the filler in the fertilizer that is reacting with agitation?? When you try to rinse it off it won't just hose off, you have to scrub it off....Reminds me of tar spots on the bottom of your car that are impossible to clean off.