What caused the residue? The protective liners (that would be a misnomer) or the ziplock bags?
Cds can withstand quite a few cleaning solutions but you need to be sure about the one you use. I don't think that there would be any harm in trying a little soap and water.
There are many threads about cleaning Cds to consult. Her's one to start:
https://forum.audiogon.com/discussions/best-way-to-clean-cd-s?highlight=cleaning%2Bcds
Cds can withstand quite a few cleaning solutions but you need to be sure about the one you use. I don't think that there would be any harm in trying a little soap and water.
There are many threads about cleaning Cds to consult. Her's one to start:
https://forum.audiogon.com/discussions/best-way-to-clean-cd-s?highlight=cleaning%2Bcds