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The relays are inside the wiper switch itself. You have to take it out and take it apart to replay the relays. Unfortunately, they can't be cleaned and only replaced.
You'll need to have decent soldering skills to replace them because once you've taken the switch out and taken the plastic off you need to heat up the solder points and split the boards to gain access to the relays.
I have seen someone offering rebuilt switches or a rebuilding service on ebay for $60 or so.
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