Not my idea, but I was told an old credit card makes a good groove cleaning tool. I have a constant supply of hotel plastic "keys" and I am dang sure going to try this idea! (maybe this afternoon)
The right size zip tie works great. I always have one in my kit. In the workshop areas where it mostly gets done, I use this tool: Worthless for me as a depth gauge guide.
I have the same tool and will use it to scrape out the bar groove...when i remember! I've also used a piece of cardboard in a pinch.
I always liked the Oregon hawk bill tool. It works good for cleaning the oil inlet and for dragging gunk out of the groove.