The little circle that looks like an o means that the string is played open (it is not fretted). If there is an x at the top, then that string is not played at all.
Try toothpaste, which works really well for soot and scorch marks. Put a thin coat of toothpaste across the scorch, leave for 10 - 20 minutes, then clean off with...
Yes, this is probably common as some of the blended leaves will be in pieces that are too small for a simple filtering material. If you want to filter as...
Make sure the hook is going all the way down. Some clasps will only close completely in one direction. In other words, take out the hook, turn it 180 and...