So I have three regular cast iron pans, and I have the care and cleaning of them down pat. However, I got a cast iron grill pan a few months ago, and am having a difficult time keeping it clean without ruining the seasoning -- food and greese gets down into the grooves, and is really difficult to get out. I've had to resort to soap a few times because everything else I tried didn't work, and it doesn't have the nice well seasoned finish that my other cast iron pans have. Any good tips for caring for the grill pan? I tried the Lodge site, but it wasn't really helpful.