It makes sense to me that if ASRock is telling you on page 37 of the manual to use a 2 pin jumper to do a CMOS clear then either the jumper should be included or a webpage listed where you can order one.
Because if the manual says to use a bridge cap, there should be one in the box. Surely a company like ASRock can put a 5 cent 2 pin jumper cap in the box.
I was able to remove the sticker residue using my fingers but it took a long time to remove the residue. I'm still waiting on ASRock tech support to tell me why the CMOS jumper cap was not in the box.