Hate warts! I'm like DL, unless it's a show calf, I leave them alone.
We pull them off w/ tweezers, fingers or dental floss works well too. Let them bleed out. Try to get as much of the root as possible. I've fed them back but can't honestly tell if it helped.
The vaccine has given us mixed results. Once used it on a heifer & she got a worse out break than had before. I guess the vaccine is only for certain strains & doesn't cover all of them.Also it can cause allergic reactions or shock so be carful to watch them after giving it. I've used the wart-off product but never got any results from it.
Good luck, they can be a total pain!
Red