Using same silicone toddler bib for both meat and milk

Kashrut
1
  1. Is it preferable for one bib to be fpr meat (not dairy), and another one to be for dairy (not meat)?
  2. If #1 is yes, after the fact, can we now convert a silicone bib that was alternating back and forth to meat-only or dairy-only (since bib is not used over a fire)?
2

Not needed