In article ,
Mys Terry wrote:

Actually, for some situations, it's the only thing that works! The
idea is to FILL the lock with grease so nothing else can get in. I
used to have to cut off (the key no longer would open them) padlocks
on my boat and replace them every season. I started packing them with
marine winch grease, and have not had to replace a single one in
several years now. The grease makes sure that all the sand, grit and
salt water stay OUTSIDE the lock.

Try STP in your locks; you will be pleasantly surprised.

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