First time poster.....
Ive been getting this residue on my WSM lately. It looks like rust but its flaky. It comes off easy but after a cook, once the cooker cools I opened the lid and could see it blowing in the sunshine. Its on the lid and the top 1/3 of the cooker. Any thoughts on what this is and how to prevent it? Thanks!

Ive been getting this residue on my WSM lately. It looks like rust but its flaky. It comes off easy but after a cook, once the cooker cools I opened the lid and could see it blowing in the sunshine. Its on the lid and the top 1/3 of the cooker. Any thoughts on what this is and how to prevent it? Thanks!
