I sprayed Boeshield T-9 into the locks. Boeshield is a teflon impregnated wax in an spray can. It was developed by Boeing to lube hinges and the like on aircraft. Boeing was concerned about the dirt pickup associated with grease. Anyway the T-9 works great on locks (and bike chains). I buy it at West Marine. I also use it on my power antenna because it doesn't show.

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JSR

1983 300D Turbo
1995 E320 Wagon
2001 MR2 Spyder
2001 Subura WRX Sedan