I'm trying to disconnect the plastic quick-connect supply line connection for the kitchen sink sprayer. I have pushed up the connector and squeezed the plastic clip, but it does not come apart. Even tried using pliers on the clips.Any suggestions?

It depends what brand of faucet it is. But in general, that white plastic clip has two ends. You squeeze them with two fingers and push it inward. Connector will become loose. Back to you. Milo

Here is a quick visual of what Milo is talking about: