Ask the daycare if they have a policy regarding paci clips.
It's OK to ask things like that; they should be able to answer it.
Frankly, I'd skip it. Daycares usually don't allow shoes in the infants' rooms, so the floors are probably fairly clean.
If you're still paranoid, send paci wipes. The First Years makes the ones I used, but I'm sure there are other brands:
http://www.amazon.com/The-First-Year...5554517&sr=1-3
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle