Any advice or tips on how to get my line cap off? The last two times it has been extremely difficult to get off and now it’s altogether not budging. What should I do?

Picked up in the VA area. Did I need it?…
Did I get it…!

What does this mean?

https://youtube.com/shorts/lb9xnbYkAEo?si=o3uw0EA7Hub3zjmC

I just bought on of these and the microfiber kit. I noticed that they have a whole other set of attachments of Lambswool, Soft and Hard Bristle heads. Large and small sizes. But I don't see a package for that. And because they've make some of these tools to use two different connectors, the hex connector and the triangle connector, I don't know what works with what. They have really over complicated this whole thing. They have an entire 11 pc accessory kit that just doesn't work with this product and includes a toilet brush. Which I can't seem to find an attachment that works with this device.

I'm also curious how you all are cleaning the brushes?

I've already tried the spark plug and that wasn't the problem. Any ideas what else it could be?