I use Iodophor for sanitizing and sterilizing. I transferred my SP to carboys yesterday and did not see a huge stain on my kitchen counter that was under the towel. I was very upset because my kitchen was completely re-done 11 months ago.
There was a huge stain on my new counter-top that I did not see yesterday and the stain was dry! I tried a few things and nothing removed the stain.
I thought I would pass this on - I left a very wet dish rag that had liquid dish soap and plain ammonia sitting on the stain. It took a few hours but the stain is now gone!