I have an 09 XC90. I'm getting a high pitch, intermittent squeak coming from the drivers side windshield wiper post. It occurs for 4-5 cycles, goes away for maybe 20 cycles, and returns. It happens with or without the blade attached. I sprayed some silicone lubricant. No change. Anyone have any ideas?

What brand of blades do you use ? There might be a fitment issue, had one of those myself.

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Maybe time to replace your windshield. The followings are some signs. You will see and or hear signs of wear like rounded or ragged blade edges, streaking and smearing on the windshield.Typically the chattering sound you hear is from the hardened rubber blades that won't flip over on each stroke. The same things also happpened to my Proton Saga new.